Updated on 2024/07/18

写真a

 
HOU Yafei
 
Organization
Faculty of Environmental, Life, Natural Science and Technology Associate Professor
Position
Associate Professor
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Degree

  • 博士(工学) ( 高知工科大学 )

  • 博士(理学)

  • 修士(工学)

Research Areas

  • Manufacturing Technology (Mechanical Engineering, Electrical and Electronic Engineering, Chemical Engineering) / Communication and network engineering  / MIMOシステム、機器学習、位置推定、5G・6G、次世代デジタルTVシステム

Education

  • Fudan University    

    2002.9 - 2007.7

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  • Kochi University of Technology   基盤工学研究科  

    2004.4 - 2007.3

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Research History

  • Okayama University   Faculty of Environmental, Life, Natural Science and Technology   Associate Professor

    2024.4

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  • Okayama University   The Graduate School of Natural Science and Technology   Assistant Professor

    2017.4 - 2024.3

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  • Advanced Telecommunications Research Institute International   Wave Engineering Laboratories   Visiting Researcher

    2014.4 - 2024.3

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  • Nara Institute of Science and Technology   The Division of Information Science   Assistant Professor

    2014.4 - 2017.3

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  • Advanced Telecommunications Research Institute International   Wave Engineering Laboratories   Researcher fellow

    2010.10 - 2014.3

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  • Ryukoku University   Research Center for Information Communication Systems   Postdoctoral fellow

    2007.8 - 2010.9

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Professional Memberships

  • IEEE Communication Society / Signal Processing Society (Senior Member)

    2008.4

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  • IEICE (Senior Member)

    2007.5

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Committee Memberships

  • IEEE Access   Associate Editor  

    2021.9   

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    Committee type:Academic society

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  • IEEE Consumer Technology Society News on Consumer Technology   Editorial Board  

    2021.6   

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    Committee type:Academic society

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Papers

  • A study for 2-D indoor localization using multiple leaky coaxial cables Reviewed

    Junjie Zhu, Pengcheng Hou, Yafei Hou, Satoshi Denno, Minoru Okada

    APSIPA Transactions on Signal and Information Processing   9   1 - 9   2020.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:CAMBRIDGE UNIV PRESS  

    Indoor localization technology, which can provide the location information of the target object or stochastic things, is becoming essential requirement for many applications and services such as Internet-of-Things (IoT), real-time control in the development of Fifth-generation (5G) technology. Leaky coaxial cable which can be used as antennas is able to detect the location of the user in a simple way due to its potential property. In this paper, we proposes a simple method to improve the localization accuracy of 2-D indoor localization using multiple LCX cables. In addition, we also evaluate the channel capacity loss due to the localization error of the LCX-MIMO using our proposed method.

    File: 45 A-study-for-2-d-indoor-localization-using-multiple-leaky-coaxial-cables.pdf

    DOI: 10.1017/ATSIP.2020.18

    Web of Science

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  • Capacity of 4-by-4 MIMO Channel Using One Composite Leaky Coaxial Cable With User Position Information Reviewed

    Yafei Hou, Junjie Zhu, Satoshi Denno, Minoru Okada

    IEEE Transactions on Vehicular Technology   68 ( 11 )   11042 - 11051   2019.11

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Leaky coaxial cable (LCX) is applied broadly for many application scenarios because it can be utilized as antenna for user localization, wireless power transfer (WPT) and wireless coverage. Usually, one LCX can be used as one antenna, and therefore more cables are required for the configuration of an multiple-input and multiple-output (MIMO) system. This paper will provide a simple design that a 4-by-4 MIMO channel can be realized with one composite cable. Therefore the proposal can release the space limitation for MIMO deployment. The results show that, over 5 GHz frequency band, even though the distance between two V-type LCXs is 2 cm, the proposed 4-by-4 LCX-MIMO can have good channel condition which ensures the proposed composite cable can be made as a finer one. In addition, using user's position information (PI), we propose a simple power allocation scheme for the proposed LCX-MIMO system. Compared with the allocation method of equal power, the proposed method using PI can largely improve its capacity with the same level of computational complexity and without requirement of the feedback of channel status information (CSI).

    File: 39 IEEETVTHou201911.pdf

    DOI: 10.1109/TVT.2019.2942945

    Web of Science

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  • Capacity Evaluation of MIMO Channel With One Leaky Coaxial Cable Used as Two Antennas Over Linear-Cell Environments Reviewed

    Yafei Hou, Satoshi Tsukamoto, Sha Li, Takeshi Higashino, Kiyoshi Kobayashi, Minoru Okada

    IEEE Transactions on Vehicular Technology   66 ( 6 )   4636 - 4646   2017.6

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC  

    Leaky coaxial (LCX) cable is widely used in wireless communication systems as an antenna, especially for a long and narrow area called the linear-cell environment. The general usage of LCX cable is that it can be treated as one antenna. To configure a multiple-input-multiple-output (MIMO) system, it requires more than one LCX cable. In this paper, we propose a simple design in which one single LCX cable can be used as two antennas. Therefore, the proposal reduces the cost and spacing requirement and releases the space requirement of MIMO deployment for wireless application over linear-cell environments. We will study the capacity of the proposed LCX-MIMO system using equal power (EP) allocation and water-filling power allocation and compare its capacity with the conventional MIMO system using monopole antennas. The capacity results over the 2.4 GHz band and the 5 GHz band show that the proposed LCX-MIMO channel has better capacity than that of using monopole antennas over linear-cell environments. In particular, it can achieve more capacity improvement than that of channel using monopole antennas with the simple EP allocation. The throughput experiments over 5 GHz also show that our proposal can achieve the higher and stable throughput over the radiation coverage of LCX cable.

    File: 26 IEEETVT 201706.pdf

    DOI: 10.1109/TVT.2016.2612683

    Web of Science

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  • Low Complexity Overloaded MIMO Non-Linear Detector with Iterative LLR Estimation Reviewed

    Satoshi Denno, Shuhei Makabe, Yafei Hou

    IEICE Transactions on Communications   E107-B ( 3 )   339 - 348   2024.3

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.23919/transcom.2023ebp3118

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  • WLAN Channel Status Duration Prediction for Audio and Video Services Using Probabilistic Neural Networks.

    Yafei Hou, Satoshi Denno

    IEEE Access   12   28201 - 28211   2024

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1109/ACCESS.2024.3365188

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  • Overloaded MIMO Bi-Directional Communication with Physical Layer Network Coding in Heterogeneous Multihop Networks Reviewed

    Satoshi DENNO, Tomoya TANIKAWA, Yafei HOU

    IEICE Transactions on Communications   E106.B ( 11 )   1228 - 1236   2023.11

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    DOI: 10.1587/transcom.2023ebp3038

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  • An Overloaded MIMO 2-Hop Network With Physical Layer Network Coding Reviewed

    Satoshi Denno, Tomoya Tanikawa, Yafei Hou

    2023 28th IEEE Asia-Pacific Conference on Communications (APCC 2023)   1 - 5   2023.11

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  • Multi Stage LLR Estimation With Ordering in A Non-linear Receiver For Overloaded MIMO Systems Reviewed

    Satoshi Denno, Shuhei Makabe, Yafei Hou

    26th International Symposium on Wireless Personal Multimedia Communications (WPMC 2023)   1 - 6   2023.11

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  • Channel Pattern Selection for RIS Based Spatial Modulation System Using Genetic Algorithm Reviewed

    Issei Maesaki, Haruya Mushiake, Yafei Hou, Satoshi Denno

    2023 IEEE 12th Global Conference on Consumer Electronics (IEEE GCCE 2023)   1 - 2   2023.10

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)  

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  • Iterative User Scheduling Method for MU-MIMO-OFDM Systems Reviewed

    Akihiko Yamada, Satoshi Denno, Yafei Hou

    2023 IEEE 12th Global Conference on Consumer Electronics (IEEE GCCE 2023)   1 - 2   2023.10

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  • A Lattice Reduction Aided Overloaded Multi-user MIMO Reviewed

    Kazuki Miyata, Satoshi Denno, Yafei Hou

    2023 IEEE 98th Vehicular Technology Conference (IEEE VTC-Fall 2023)   1 - 5   2023.10

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  • Spatial Modulation Proposal for 2-by-2 MIMO System Using Single Leaky Coaxial Cable Reviewed

    Yafei Hou, Soichiro Dake, Yusuke Kawai, Satoshi Denno

    1 - 5   2023.10

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  • Characteristics of Frequency Domain Non-Orthogonal Multiple Wireless Access for IoT Reviewed

    Yuto Ohba, Satoshi Denno, Yafei Hou

    2023 IEEE 12th Global Conference on Consumer Electronics (IEEE GCCE 2023)   1 - 2   2023.10

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  • Low Complexity Resource Allocation in Frequency Domain Non-Orthogonal Multiple Access.

    Satoshi Denno, Taichi Yamagami, Yafei Hou

    IEICE Transactions on Communications   106 ( 10 )   1004 - 1014   2023.10

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    Publishing type:Research paper (scientific journal)  

    DOI: 10.1587/transcom.2023ebp3009

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  • Study on channel prediction in IRS-assisted wireless communication systems

    Norisato Suga, Kazuto Yano, Yafei Hou, Toshikazu Sakano

    IEICE Communications Express   12 ( 7 )   374 - 378   2023.7

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    Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/comex.2023xbl0035

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  • Indoor 3-D Localization over LCX-based Wireless Environment Using Particle Filter Approach Reviewed

    Junjie Zhu, Kenda Nagayama, Erika Kouda, Yafei Hou, Satoshi Denno

    IEEE Wireless Communications and Networking Conference (WCNC 2023)   1 - 6   2023.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    File: PID2023000153.pdf

    DOI: 10.1109/WCNC55385.2023.10118703

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    Other Link: https://dblp.uni-trier.de/db/conf/wcnc/wcnc2023.html#ZhuNKHD23

  • Reduced Complexity Resource Allocation For Frequency Domain Non-orthogonal Multiple Access Reviewed

    Satoshi Denno, Taichi Yamagami, Yafei Hou

    IEEE Wireless Communications and Networking Conference (WCNC 2023)   1 - 6   2023.3

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    File: PID2022002577.pdf

    DOI: 10.1109/WCNC55385.2023.10118697

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    Other Link: https://dblp.uni-trier.de/db/conf/wcnc/wcnc2023.html#DennoYH23

  • MUSIC Spectrum Based Interference Detection and Localization for mmWave RIS-MIMO System Reviewed

    Yafei Hou, Kazuto Yano, Narisato Suga, Satoshi Denno, Toshikazu Sakano

    2023 25th International Conference on Advanced Communication Technology (ICACT)   1 - 6   2023.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.23919/icact56868.2023.10079677

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  • Superposition Signal Input Decoding For Lattice Reduction-aided MIMO Receivers Reviewed

    Satoshi DENNO, Koki KASHIHARA, Yafei HOU

    IEICE Transactions on Communications   E106-B ( 2 )   184 - 192   2023.2

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    File: e106-b_2_184.pdf

    DOI: 10.1587/transcom.2022ebp3051

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  • Multi-input Physical Layer Network Coding in Two-Dimensional Wireless Multihop Networks Reviewed

    Hideaki TSUGITA, Satoshi DENNO, Yafei HOU

    IEICE Transactions on Communications   E106-B ( 2 )   193 - 202   2023.2

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    File: e106-b_2_193.pdf

    DOI: 10.1587/transcom.2022ebp3062

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  • Simultaneous Localization for Wireless Environments using Leaky Coaxial Cables.

    Yafei Hou, Erika Kouda, Yusuke Kawai, Satoshi Denno

    ICCE-Taiwan   733 - 734   2023

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    Publishing type:Research paper (international conference proceedings)  

    DOI: 10.1109/ICCE-Taiwan58799.2023.10226659

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    Other Link: https://dblp.uni-trier.de/db/conf/icce-tw/icce-tw2023.html#HouKKD23

  • Genetic Algorithm Based Channel Pattern Selection for Spatial Modulation Using Slots of Leaky Coaxial Cable Reviewed

    Kenda Nagayama, Erika Kouda, Junjie Zhu, Yafei Hou, Satoshi Denno

    25th International Symposium on Wireless Personal Multimedia Communications (WPMC 2022), Hybrid (Herning, Denmark & Virtual), Oct. 30- Nov. 2, 2022   1 - 5   2022.10

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  • Adaptive Collaborative Relaying in High Mobility Environment Reviewed

    Satoshi Denno, Takumi Fujii, Yafei Hou

    25th International Symposium on Wireless Personal Multimedia Communications (WPMC 2022), Hybrid (Herning, Denmark & Virtual), Oct. 30- Nov. 2, 2022   1 - 5   2022.10

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/WPMC55625.2022.10014789

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    Other Link: https://dblp.uni-trier.de/db/conf/wpmc/wpmc2022.html#DennoFH22

  • Adaptive Resource Allocation Based on Factor Graphs in Non-Orthogonal Multiple Access Reviewed

    Taichi YAMAGAMI, Satoshi DENNO, Yafei HOU

    IEICE Transactions on Communications   E105-B ( 10 )   1 - 10   2022.10

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    DOI: 10.1587/transcom.2021ebp3213

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  • A Low Complexity Non-linear Iterative Receiver for Overloaded MIMO-OFDM Systems Reviewed

    Shuhei Makabe, Satoshi Denno, Yafei Hou

    2022 27th Asia Pacific Conference on Communications (APCC 2022), (Jeju Island & Virtual), Oct. 19-21, 2022   1 - 6   2022.10

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    DOI: 10.1109/APCC55198.2022.9943716

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    Other Link: https://dblp.uni-trier.de/db/conf/apcc/apcc2022.html#MakabeDH22

  • Asynchronous Periodic Interference Signals Cancellation in Frequency Domain Reviewed

    Satoshi DENNO, Yafei HOU

    IEICE Transactions on Communications   E105.B ( 9 )   1087 - 1096   2022.9

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    DOI: 10.1587/transcom.2021ebp3187

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  • Low Complexity Soft Decoding With Superposition of Hard Decision Vectors in Lattice Reduction-Aided Linear Receivers Reviewed

    Satoshi Denno, Koki Kashihamra, Yafei Hou

    IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2022), (Virtual), Sept. 12-15, 2022   55 - 59   2022.9

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/PIMRC54779.2022.9977505

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    Other Link: https://dblp.uni-trier.de/db/conf/pimrc/pimrc2022.html#DennoKH22

  • Particle Filter-Based Indoor Localization and Tracking Method Using Leaky Coaxial Cables Reviewed

    Junjie Zhu, Kenda Nagayama, Erika Kouda, Yafei Hou, Satoshi Denno

    IEEE 33rd Annual International Symposium on Personal, Indoor and Mobile Radio Communications (PIMRC 2022), (Virtual), Sept. 12-15   595 - 600   2022.8

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/PIMRC54779.2022.9977753

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    Other Link: https://dblp.uni-trier.de/db/conf/pimrc/pimrc2022.html#ZhuNKHD22

  • Periodic Interference Cancellation With Drift Estimation Based on Super-Resolution Techniques in Frequency Domain Reviewed

    Satoshi Denno, Yafei Hou

    2022 IEEE 95th Vehicular Technology Conference: (VTC2022-Spring)   1 - 6   2022.6

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    Authorship:Last author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/vtc2022-spring54318.2022.9860405

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  • Maximum Doppler Frequency Detection Based on Likelihood Estimation With Theoretical Thresholds Reviewed

    Satoshi DENNO, Kazuma HOTTA, Yafei HOU

    IEICE Transactions on Communications   E105.B ( 5 )   657 - 664   2022.5

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    DOI: 10.1587/transcom.2021ebp3075

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  • Tunable broadband terahertz metamaterial absorber based on vanadium dioxide Reviewed

    Guishuang Yang, Fengping Yan, Xuemei Du, Ting Li, Wei Wang, Yuling Lv, Hong Zhou, Yafei Hou

    AIP Advances   12 ( 4 )   045219 - 045219   2022.4

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:AIP Publishing  

    The special electromagnetic properties of metamaterials have contributed to the development of terahertz technology, and terahertz broadband absorbers for various applications have been investigated. The design of metamaterial absorbers with tunability is in a particularly attractive position. In this work, a tunable broadband terahertz metamaterial absorber is proposed based on the phase transition material vanadium dioxide (VO2). The simulation results show that an excellent absorption bandwidth reaches 3.78 THz with the absorptivity over 90% under normal incidence. The absorptivity of the proposed structure can be dynamically tuned from 2.7% to 98.9% by changing the conductivity of VO2, which changes the structure from a perfect reflector to an absorber. An excellent amplitude modulation with the absorptivity is realized. The mechanism of broadband absorption is explored by analyzing the electric field distribution of the absorber based on impedance matching theory. In addition, it also has the advantage of polarization and incident angle insensitivity. The proposed absorber may have a wide range of promising applications in areas such as terahertz imaging, sensing, and detection.

    DOI: 10.1063/5.0082295

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  • Indoor Simultaneous TOA Estimation of Multiple Users Using Leaky Coaxial Cable Reviewed

    Junjie Zhu, Erika Kouda, Pengcheng Hou, Kenta Nagayama, Yafei Hou, Satoshi Denno

    2022 IEEE 4th Global Conference on Life Sciences and Technologies (LifeTech)   297 - 298   2022.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/lifetech53646.2022.9754835

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  • Two-dimensional RSSI-Based Indoor Localization Using Multiple Leaky Coaxial Cables with a Probabilistic Neural Network Reviewed

    Junjie Zhu, Pengcheng Hou, Kenta Nagayama, Yafei Hou, Satoshi Denno, Rian Ferdian

    IEEE Access   10   21109 - 21119   2022.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    File: Two-Dimensional_RSSI-Based_Indoor_Localization_Using_Multiple_Leaky_Coaxial_Cables_With_a_Probabilistic_Neural_Network.pdf

    DOI: 10.1109/access.2022.3153083

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  • Prediction Evaluation for RSSI Data Generated from Leaky Coaxial Cables over Indoor Environment Reviewed

    Pengcheng Hou, Junjie Zhu, Kenta Nagayama, Yafei Hou, Satoshi Denno

    2022 IEEE International Conference on Consumer Electronics (ICCE)   1 - 5   2022.1

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    DOI: 10.1109/icce53296.2022.9730575

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  • Thermally-stable graphene metamaterial absorber with excellent tunability for high-performance refractive index sensing in the terahertz band Reviewed

    Xuemei Du, Fengping Yan, Wei Wang, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou

    Optics and Laser Technology   144   107409 - 107409   2021.12

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    Authorship:Last author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Elsevier BV  

    File: 1-s2.0-S0030399221004977-main.pdf

    DOI: 10.1016/j.optlastec.2021.107409

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  • RSSI-Based Indoor Localization Using Leaky Coaxial Cable with a PNN Approach Reviewed

    Junjie Zhu, Pengcheng Hou, Kenta Nagayama, Yafei Hou, Satoshi Denno

    2021 IEEE 10th Global Conference on Consumer Electronics (GCCE)   220 - 221   2021.10

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    DOI: 10.1109/gcce53005.2021.9622078

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  • Eigenvalue Based Relay Selection for XOR-Physical Layer Network Coding in Bi-Directional Wireless Relaying Networks Reviewed

    Satoshi DENNO, Kazuma YAMAMOTO, Yafei HOU

    IEICE Transactions on Communications   E104.B ( 10 )   1336 - 1344   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electronics, Information and Communications Engineers (IEICE)  

    File: e104-b_10_1336.pdf

    DOI: 10.1587/transcom.2020ebp3183

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  • A Broadband Switchable Metamaterial Absorber/Reflector Based On Multi-Laps Graphene Sheets in the Terahertz Band Reviewed

    Xuemei Du, Fengping Yan, Wei Wang, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou

    IEEE Photonics Journal   13 ( 5 )   1 - 8   2021.10

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    Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    File: A_Broadband_Switchable_Metamaterial_Absorber_Reflector_Based_On_Multi-Laps_Graphene_Sheets_in_the_Terahertz_Band.pdf

    DOI: 10.1109/jphot.2021.3109045

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  • Out-of-Bound Signal Demapping for Lattice Reduction-Aided Iterative Linear Receivers in Overloaded MIMO Systems Reviewed

    Takuya FUJIWARA, Satoshi DENNO, Yafei HOU

    IEICE Transactions on Communications   E104.B ( 8 )   974 - 982   2021.8

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    DOI: 10.1587/transcom.2020ebp3180

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  • WLAN Interference Identification Using a Convolutional Neural Network for Factory Environments Reviewed

    Julian Webber, Kazuto Yano, Norisato Suga, Yafei Hou, Eiji Nii, Toshihide Higashimori, Abolfazl Mehbodniya, Yoshinori Suzuki

    Journal of Communications   16 ( 7 )   276 - 283   2021.7

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    File: 20210618052654509.pdf

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  • Modeling and Predictability Analysis on Channel Spectrum Status over Heavy Wireless LAN Traffic Environment Reviewed

    Yafei Hou, Julian Webber, Kazuto Yano, Shun Kawasaki, Satoshi Denno, Yoshinori Suzuki

    IEEE Access   9   85795 - 85812   2021.6

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    File: 09452090.pdf

    DOI: 10.1109/access.2021.3088123

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  • Indoor Localization Using Leaky Coaxial Cable over a Multipath-rich Linear Cell Environment

    Junjie Zhu, Kenta Nagayama, Yafei Hou, Satoshi Denno

    2021 IEEE 3rd Global Conference on Life Sciences and Technologies (LifeTech)   280 - 281   2021.3

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    Authorship:Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/lifetech52111.2021.9391899

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  • Partial Perturbation to Alleviate the Performance Degradation of Vector Perturbation With Inaccurate Power Scaling Factors Reviewed

    Yafei Hou, Satoshi Denno

    IEEE Transactions on Broadcasting   67 ( 1 )   324 - 336   2021.3

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    File: 09033967.pdf

    DOI: 10.1109/tbc.2020.2977514

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  • Low-Complexity Implementation of Channel Estimation for ESPAR-OFDM Receiver Reviewed

    Yafei Hou, Rian Ferdian, Satoshi Denno, Minoru Okada

    IEEE Transactions on Broadcasting   67 ( 1 )   238 - 252   2021.3

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (scientific journal)   Publisher:Institute of Electrical and Electronics Engineers (IEEE)  

    File: 09290415.pdf

    DOI: 10.1109/tbc.2020.3039679

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  • Busy/Idle Duration Prediction for Video and Audio WLAN Traffics Using Autoregressive Predictor with Data Categorization

    Yafei Hou, Shun Kawasaki, Satoshi Denno

    2021 23rd International Conference on Advanced Communication Technology (ICACT)   259 - 264   2021.2

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    Authorship:Lead author, Corresponding author   Language:English   Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.23919/icact51234.2021.9370597

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  • A Study of Throughput Prediction using Convolutional Neural Network over Factory Environment

    Yafei Hou, Kazuto Yano, Norisato Suga, Julian Webber, Eiji Nii, Toshihide Higashimori, Satoshi Denno, Yoshinori Suzuki

    2021 23rd International Conference on Advanced Communication Technology (ICACT)   2021-February   429 - 434   2021.2

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    In this paper, using the time-series throughput data generated from a simulated factory scenario, we study throughput prediction using convolutional neural network (CNN). Different with image or numerical recognition using CNN, in which the distribution of the prediction target during training stage usually has the similar level, the distribution of the throughput data concentrates only on several values. This centralized distribution may degrade the prediction accuracy. Therefore, we will propose a new CNN prediction method employing target vectorization which can mitigate the centralization of distribution. This method makes training process of CNN hold more possibility and improves the prediction accuracy of the throughput.

    DOI: 10.23919/ICACT51234.2021.9370905

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  • Frequency domain iterative cancellation of periodic noise

    Yuya Furutani, Satoshi Denno, Yafei Hou

    2020 International Symposium on Antennas and Propagation, ISAP 2020   289 - 290   2021.1

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    This paper proposes frequency domain iterative cancellation for suppressing a periodic noise. The proposed cancellation alleviates a periodic noise in the desired frequency band by using an interference canceller with a replica of the noise. The proposed iterative canceller achieves superior replica estimation even when the signals in all the frequency bands are collapsed by the periodic noise. The performance of the proposed iterative cancellation is evaluated in terms of the signal power to noise power ratio(SNR) by computer simulations. The proposed cancellation obtains a gain of 25 dB even when the carrier power to noise power ratio(CNR) is about 0 dB by iterating the cancellation 2 times, while the no-iterative cancellation achieves only a gain of 4 dB.

    DOI: 10.23919/ISAP47053.2021.9391128

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  • Capacity Loss From Localization Error in MIMO Channel Using Leaky Coaxial Cable Reviewed

    Junjie Zhu, Yafei Hou, Kenta Nagayama, Satoshi Denno

    IEEE Access   9   15929 - 15938   2021.1

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    File: 09328758 (1).pdf

    DOI: 10.1109/access.2021.3053034

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  • Matrix Factorization-Based RSS Interpolation for Radio Environment Prediction Reviewed

    Norisato Suga, Kazuto Yano, Julian Webber, Yafei Hou, Eiji Nii, Toshihide Higashimori, Yoshinori Suzuki

    IEEE Wireless Communications Letters   1 - 5   2021

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    This letter proposes matrix factorization (MF) based interpolation of received signal strength (RSS) from a transmitter mounted on moving robot in factory environment. For realizing the reliable wireless communication, machine learning based channel prediction methods have been intensively studied in the past decade. However, some traffic models will make the observation of RSS sequence be intermittent, and the missing values must be interpolated before input to the predictor. Classical interpolation such as linear interpolation cannot appropriately estimate the missing values because the result of the interpolation depends on the observation time. In this letter, we propose to apply an MF-based interpolation technique to RSS interpolation in order to restore the true RSS variation pattern. Moreover, the basic MF-based interpolation is improved by introducing a smoothing term in an objective function to represent the smooth variation of the RSS sequence. The simulation results show that the MF-based interpolation can improve the prediction accuracy of the machine learning based channel prediction method.

    File: 55 IEEEWCL.pdf

    DOI: 10.1109/lwc.2021.3069979

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  • Cyclic Path Switching for Lattice Reduction-aided Iterative Linear Receivers in Overloaded MIMO Systems Reviewed

    Satoshi Denno, Takuya Fujiwara, Yafei Hou

    IEICE Communications Express   10 ( 10 )   810 - 815   2021

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    DOI: 10.1587/comex.2021xbl0133

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  • Precoded Physical Layer Network Coding with Coded Modulation in MIMO-OFDM Bi-Directional Wireless Relay Systems.

    Satoshi Denno, Kazuma Yamamoto, Yafei Hou

    IEICE Trans. Commun.   104-B ( 1 )   99 - 108   2021

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  • Non-Orthogonal Packet Access Based on Low Density Signature With Phase Only Adaptive Precoding.

    Satoshi Denno, Ryoko Sasaki, Yafei Hou

    IEICE Trans. Commun.   104-B ( 3 )   328 - 337   2021

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  • Adaptive Resource Allocation Based on Factor Graphs in Non-Orthogonal Multiple Access

    Taichi Yamagami, Satoshi Denno, Yafei Hou

    24TH INTERNATIONAL SYMPOSIUM ON WIRELESS PERSONAL MULTIMEDIA COMMUNICATIONS (WPMC 2021): PAVING THE WAY FOR DIGITAL AND WIRELESS TRANSFORMATION   2021

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    In this paper, we propose a non-orthogonal multiple access with adaptive resource allocation based on factor graphs. The proposed non-orthogonal multiple access assigns multiple frequency resources for each device to send their packet. Even if the number of the devices is more than the frequency resources, the proposed non-orthogonal access allows all the devices to transmit their packets simultaneously for high capacity massive machine type communication (mMTC). Furthermore, this paper proposes adaptive resource allocation based on factor graphs that adaptively allocates the frequency resources to the devices for improvement of the transmission performances. This paper proposes two allocation criteria for the proposed adaptive allocation. This paper shows that the proposed non-orthogonal multiple access achieves superior transmission performance in 4-path Rayleigh fading channel with overloading ratio of 1.5, even without the adaptive resource allocation. The adaptive resource allocation enables the proposed non-orthogonal access to attain a gain of about 5 dB at the BER of 10(-4).

    DOI: 10.1109/WPMC52694.2021.9700454

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  • Busy/Idle Duration Prediction for Video and Audio WLAN Traffics Using Autoregressive Predictor with Data Categorization.

    Yafei Hou, Shun Kawasaki, Satoshi Denno

    23rd International Conference on Advanced Communication Technology(ICACT)   259 - 264   2021

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    DOI: 10.23919/ICACT51234.2021.9370597

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  • User Mobility Estimation Through Maximum Doppler Frequency Detection.

    Satoshi Denno, Kazuma Hotta, Yafei Hou

    15th International Conference on Signal Processing and Communication Systems(ICSPCS)   1 - 5   2021

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    DOI: 10.1109/ICSPCS53099.2021.9660311

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  • A Study of Throughput Prediction using Convolutional Neural Network over Factory Environment.

    Yafei Hou, Kazuto Yano, Norisato Suga, Julian L. Webber, Eiji Nii, Toshihide Higashimori, Satoshi Denno, Yoshinori Suzuki

    23rd International Conference on Advanced Communication Technology(ICACT)   429 - 434   2021

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    DOI: 10.23919/ICACT51234.2021.9370905

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  • Channel Status Prediction using Auto-regressive and Auto-regressive Integrated Predictors over WLAN Channel Reviewed

    Yafei Hou, Naoya Hokimoto, Satoshi Denno

    International Journal of Computer & Software Engineering   5 ( 2 )   1 - 9   2020.12

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    File: 47 Channel_Status_Prediction_using_Auto-regressive_an_IJCSE202012.pdf

    DOI: 10.15344/2456-4451/2020/159

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  • A polarization- and angle-insensitive broadband tunable metamaterial absorber using patterned graphene resonators in the terahertz band Reviewed

    Xuemei Du, Fengping Yan, Wei Wang, Siyu Tan, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou

    Optics and Laser Technology   132   2020.12

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    The emerging material of graphene has resulted in new options for the design of metamaterial devices with excellent performances, offering an attractive platform for electromagnetic absorption applications. To date, researches on patterned graphene-based metamaterial absorbers (MAs), have focused on achieving broadband absorption while maintaining many excellent properties. Here, we propose a broadband tunable MA with a perfect absorption based on a novel design of the combination of cross- and square-shaped graphene sheets. Numerical simulation results show that the bandwidth of the proposed broadband MA reaches 2.76 THz with the absorptivity greater than 90% for both the transverse electric (TE) and transverse magnetic (TM) modes, which exceeds most of broadband absorption results achieved by MAs in previous studies. A numerical analysis em ploying the equivalent circuit model for the designed structure is conducted to determine the influence of the structural parameters on the absorptivity and optimize the parameters. Results show that impedance matching is achieved between the input impedance and the free-space impedance at the absorption band. Detailed numerical simulations are conducted to calculate the surface loss density, electric field, and surface currents to obtain an understanding of the high absorption mechanism. Also, the designed MA exhibits excellent properties, such as tunability, polarization independence, incident angle insensitivity and outstanding tolerance to changes in the structural parameters, suggesting that the proposed absorber is a promising candidate for various applications in the terahertz band.

    File: 4-A polarization- and angle-insensitive broadband tunable metamaterial absorber using patterned graphene resonators in the terahertz band.pdf

    DOI: 10.1016/j.optlastec.2020.106513

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  • An SMLB-based OFDM receiver over impulsive noise environment Reviewed

    Chengbo Liu, Na Chen, Minoru Okada, Yafei Hou

    APSIPA Transactions on Signal and Information Processing   9   1 - 8   2020.11

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    The impulsive noise (IN) damages the performance of wireless communication in modern 5G scenarios such as manufacturing and automatic factories. The proposed receiver utilizes constant false alarm rate to obtain the threshold and combines with blanking to further improve the performance of the conventional blanking scheme with acceptable complexity. The simulated results show that the proposed receiver can achieve a lower bit error rate even if the probability of IN occurrence is very high and the power of the IN is much larger than that of the background noise.

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    DOI: 10.1017/atsip.2020.22

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  • Low Complexity Soft Input Decoding in an Iterative Linear Receiver for Overloaded MIMO Reviewed

    Satoshi Denno, Tsubasa Inoue, Yuta Kawaguchi, Takuya Fujiwara, Yafei Hou

    IEICE Transactions on Communications   E103B ( 5 )   600 - 608   2020.5

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    This paper proposes a low complexity soft input decoding in an iterative linear receiver for overloaded MIMO. The proposed soft input decoding applies two types of lattice reduction-aided linear filters to estimate log-likelihood ratio (LLR) in order to reduce the computational complexity. A lattice reduction-aided linear with whitening filter is introduced for the LLR estimation in the proposed decoding. The equivalent noise caused by the linear filter is mitigated with the decoder output stream and the LLR is re-estimated after the equivalent noise mitigation. Furthermore, LLR clipping is introduced in the proposed decoding to avoid the performance degradation due to the incorrect LLRs. The performance of the proposed decoding is evaluated by computer simulation. The proposed decoding achieves about 2 dB better BER performance than soft decoding with the exhaustive search algorithm, so called the MLD, at the BER of 10(-4), even though the complexity of the proposed decoding is 1/10 as small as that of soft decoding with the exhaustive search.

    File: 42 IEICETB202005.pdf

    DOI: 10.1587/transcom.2019EBP3159

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  • Enhancing sensing capacity of terahertz metamaterial absorbers with a surface-relief design Reviewed

    Wei Wang, Fengping Yan, Siyu Tan, Haisu Li, Xuemei Du, Luna Zhang, Zhuoya Bai, Dan Cheng, Hong Zhou, Yafei Hou

    PHOTONICS RESEARCH   8 ( 4 )   519 - 527   2020.4

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    Metamaterial absorbers (MAs) serve as important electromagnetic wave-absorbing devices that have captured the attention of researchers for a long term. Functioning as sensitive detectors to determine perturbations in an ambient environment is another significant subsidiary function. Here, we theoretically propose an optimized fabrication method to implement terahertz MAs with fewer steps and also evaluate both absorption and sensing performances of such MAs realized by the new method. Simulation findings demonstrate that such MAs can basically maintain the original absorption features perfectly, including near-complete absorption at resonance as well as strong robustness to wide incident angles. Specifically, the full width at half-maximum and quality factor of the absorption resonances attenuate less than 26% and 8% with this new method, remaining in the ranges of similar to 0.03-0.04 THz and similar to 20-27 for two selected example MAs. More significantly, sensing capacities of this type of MA, in terms of maximum detection range (enhancing at least 9%), observable spectral modulation (increasing at least 6.3%), and refractive index sensitivity, are improved to a large extent because of more intense coupling between resonant field and matter in the case of surface-relief MAs. This stronger coupling results from exposing more spots of the resonantly high field to direct contact with an approaching analyte, which is illustrated by field profiles of the MAs at resonance in this work. Additionally, other desirable absorber features are also explored with such MAs, like functioning as building blocks to configure multiband MAs and strong robustness against fabrication errors. Such new-style terahertz MAs shown in the paper, acting as good examples, not only prove that terahertz MAs can be fabricated by the proposed time- and cost-saving route in contrast to the traditional MA fabrication process, but also can serve as novel platforms to explore other intriguing terahertz photonic effects, such as the field enhancement effect. (C) 2020 Chinese Laser Press

    File: prj-8-4-519.pdf

    DOI: 10.1364/PRJ.386040

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  • Estimation of Probability Density Function Using Multi-bandwidth Kernel Density Estimation for Throughput. Reviewed

    Norisato Suga, Kazuto Yano, Julian Webber, Yafei Hou, Toshihide Higashimori, Yoshinori Suzuki

    2020 International Conference on Artificial Intelligence in Information and Communication (ICAIIC)   171 - 176   2020

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    DOI: 10.1109/ICAIIC48513.2020.9065033

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  • Busy/Idle Duration Models of Video and Audio WLAN Traffics and Their Prediction Performance. Reviewed

    Yafei Hou, Shun Kawasaki, Satoshi Denno

    2020 IEEE 2nd Global Conference on Life Sciences and Technologies (LifeTech)   202 - 203   2020

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    DOI: 10.1109/LifeTech48969.2020.1570619143

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  • Two Dimensional Indoor Localization with Multiple Leaky Coaxial Cables.

    Junjie Zhu, Pengcheng Hou, Yafei Hou, Satoshi Denno, Minoru Okada

    9th IEEE Global Conference on Consumer Electronics(GCCE)   626 - 627   2020

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    DOI: 10.1109/GCCE50665.2020.9291828

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  • Bit Stream Decorrelation in An Iterative Overloaded MIMO Receiver for Higher-Order QAMs.

    Takuya Fujiwara, Satoshi Denno, Yafei Hou

    23rd International Symposium on Wireless Personal Multimedia Communications(WPMC)   1 - 5   2020

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    DOI: 10.1109/WPMC50192.2020.9309510

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  • Low Complexity Soft Decoding For Physical Layer Network Coding With Coded Modulation.

    Satoshi Denno, Tomoya Tanikawa, Hideaki Tsugita, Yafei Hou

    14th International Conference on Signal Processing and Communication Systems(ICSPCS)   1 - 5   2020

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    Publishing type:Research paper (international conference proceedings)   Publisher:IEEE  

    DOI: 10.1109/ICSPCS50536.2020.9310008

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  • Graphene-embedded broadband tunable metamaterial absorber in terahertz band

    Xue-mei Du, Feng-ping Yan, Wei Wang, Si-yu Tan, Lu-na Zhang, Zhuo-ya Bai, Hong Zhou, Ya-fei Hou

    Journal of Optics (United Kingdom)   22 ( 1 )   2020

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    Numerous studies have been conducted to design terahertz broadband metamaterial absorbers for various applications, such as electromagnetic stealth, photodetection, and broadband communications. It remains a hot research topic to design metamaterial absorbers (MAs) to achieve broadband absorption while maintaining a wide range of tunability. Here, we present a novel design of graphene-embedded metamaterial functioning as a broadband tunable absorber based on the field reinforcement effect and plasmon resonance of graphene. With a stacked configuration, the absorptivity of the MA proposed in this paper can be as high as 90% in a wide range of 1.2 THz. By comparative analysis, we exhibit that the MA shows a relatively wider absorption bandwidth than the one without the embedded graphene, which discloses the significance of integrating graphene layer in our design. The detailed numerical calculations of the surface currents and electric field distributions are presented in this paper to better uncover the physical mechanisms of the broadband and multi-band absorption. Moreover, further numerical calculations show that the designed MA also demonstrates several other excellent properties, such as tunability, polarization insensitivity, incident angle insensitivity and outstanding structural parameters tolerance. The proposed graphene-embedded MA can be used in various promising applications, like smart sensors, broadband absorber and imaging devices.

    DOI: 10.1088/2040-8986/ab56c0

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  • Symmetry Breaking and Resonances Hybridization in Vertical Split Ring Resonator Metamaterials and the Excellent Sensing Potential Reviewed

    Wei Wang, Fengping Yan, Siyu Tan, Haisu Li, Xuemei Du, Luna Zhang, Zhuoya Bai, Dan Cheng, Hong Zhou, Yafei Hou

    IEEE/OSA Journal of Lightwave Technology   37 ( 19 )   5149 - 5157   2019.10

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    The resonances with narrow linewidths generated in metamaterials are valuable for numerous applications ranging from bio-sensing to narrow-band filter. And breaking structural symmetry of metamaterials is one of the common and efficient approaches to achieve such sharp resonances. In this paper, we present symmetry breaking introduced in vertical split ring resonators (VSRR) metamaterials to excite narrow resonance. Different from the previously reported planar asymmetric metamaterials, the three-dimensional metamaterials are dominantly excited by the magnetic field component of the terahertz illumination together with the electric component. In this case, sharp resonances with characteristic magnetic field distributions are excited. And the sharpest resonance shows up with an ultra-narrow line-width (full width at half maximum, FWHM is 5.90 GHz) and high Q of 327 at 1.93 THz. Through systematic theoretical analysis and numerical mode implementation, we reveal the sharp resonance dips are produced by resonance hybridization between a resonance mode induced by the destruction of the structural symmetry and another special resonance inherent in the symmetric VSRR metamaterials. In addition, the fabrication robustness and sensing potential of the asymmetric VSRR metamaterials are explored in this paper. The results show that the AVSRR design is insensitive to the errors in the fabrication process, like rough metal surface and smoothmetal corner, but highly sensitive to the approaching substance, which prove the excellent sensing performance.

    File: 38 IEEEOSAJLT_2019_10.pdf

    DOI: 10.1109/JLT.2019.2929771

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  • A Study of Capacity Loss from Localization Error in MIMO Channel Using Leaky Coaxial Cable. Reviewed

    Junjie Zhu, Yafei Hou, Satoshi Denno, Minoru Okada

    2019 IEEE 8th Global Conference on Consumer Electronics (GCCE)   1002 - 1003   2019.10

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    DOI: 10.1109/GCCE46687.2019.9015621

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  • XOR Physical Layer Network Coding with Non-Linear Precoding for Quadrature Amplitude Modulations in Bi-Directional MIMO Relay Systems Reviewed

    Satoshi Denno, Yuto Nagai, Yafei Hou

    IEICE TRANSACTIONS ON COMMUNICATIONS   E102B ( 10 )   2073 - 2081   2019.10

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    This paper proposes an XOR physical layer network coding (XOR-PLNC) with non-linear precoding for quadrature amplitude modulations (QAMs) in bi-directional MIMO relay systems. The proposed XOR-PLNC applies power loading in order to improve the transmission performance. The proposed XOR-PLNC introduces a modulus adapted to channel gains. Moreover, the modulus is further reduced in cooperation with modulo operation which the non-linear precoding employs for improvement of transmission power efficiency. The use of the reduced modulus improves the energy efficiency of the signal transmission, which improves the transmission performance in the proposed XOR-PLNC. The performance is evaluated by computer simulations in bi-directional MIMO relay channels with 16QAM to 1024QAM.

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    DOI: 10.1587/transcom.2018EBP3346

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  • Numerical Analysis of Magnetic Plasmonic Resonance Modes in Three-Dimension Split Ring Resonator Metamaterials Reviewed

    Wei Wang, Feng-Ping Yan, Si-Yu Tan, Hai-Su Li, Xue-Mei Du, Hong Zhou, Yafei Hou

    IEEE Photonics Journal   11 ( 4 )   1 - 10   2019.8

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    File: 37 IEEEPJ_201908.pdf

    DOI: 10.1109/jphot.2019.2917539

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  • A Novel Low Complexity Lattice Reduction-Aided Iterative Receiver for Overloaded MIMO Reviewed

    Satoshi Denno, Yuta Kawaguchi, Tsubasa Inoue, Yafei Hou

    IEICE TRANSACTIONS ON COMMUNICATIONS   E102B ( 5 )   1045 - 1054   2019.5

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    This paper proposes a novel low complexity lattice reduction-aided iterative receiver for overloaded MIMO. Novel noise cancellation is proposed that increases an equivalent channel gain with a scalar gain introduced in this paper, which results in the improvement of the signal to noise power ratio (SNR). We theoretically analyze the performance of the proposed receiver that the lattice reduction raises the SNR of the detector output signals as the scalar gain increases, when the LenstraLenstra- Lova's (LLL) algorithm is applied to implement the lattice reduction. Because the SNR improvement causes the scalar gain to increase, the performance is improved by iterating the reception process. Computer simulations confirm the performance. The proposed receiver attains a gain of about 5 dB at the BER of 10(-4) in a 6 x 2 overloaded MIMO channel. Computational complexity of the proposed receiver is about 1/50 as much as that of the maximum likelihood detection (MLD).

    File: 33 IEICETB201905.pdf

    DOI: 10.1587/transcom.2018EBP3215

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  • Near Optimum User Selection for Minimum Mean Square Error Based Tomlinson Harashima Precoding

    Satoshi Denno, Tomoyuki Baba, Kenta Asaka, Yafei Hou

    International Journal of Computer & Software Engineering   4 ( 1 )   2019.1

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    DOI: 10.15344/2456-4451/2019/142

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  • Prediction of QoS Outage Probability for Wireless Communication in Factory Environments. Reviewed

    Norisato Suga, Kazuto Yano, Julian Webber, Yafei Hou, Toshihide Higashimori, Yoshinori Suzuki

    2019 International Conference on Internet of Things, Embedded Systems and Communications (IINTEC)   124 - 129   2019

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    DOI: 10.1109/IINTEC48298.2019.9112098

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  • Iterative Soft Input Decoding with Assistance of Lattice Reduction for Overloaded MIMO. Reviewed

    Satoshi Denno, Tsubasa Inoue, Takuya Fujiwara, Yafei Hou

    2019 IEEE 90th Vehicular Technology Conference (VTC2019-Fall)   1 - 5   2019

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    DOI: 10.1109/VTCFall.2019.8891589

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  • Low Density Signature based Packet Access with Phase Only Adaptive Precoding Reviewed

    Satoshi Denno, Ryoko Sasaki, Yafei Hou

    2019 IEEE 89TH VEHICULAR TECHNOLOGY CONFERENCE (VTC2019-SPRING)   1 - 5   2019

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    This paper proposes a low density signature-based packet access with phase only adaptive precoding. The proposed access allows multiple user terminals to send their packets simultaneously though only one antenna is put on terminals and on an access point, in order to increase network throughput. The proposed phase only adaptive precoding improves the transmission performance by rotating the transmission signal phase. This paper proposes a criterion that defines the optimum rotation angle, and actual two techniques to estimate the angle. When 6 packets are transmitted in 4 time slots, the proposed adaptive precoding attains about a gain of 4dB at the BER of 10(-4) in a single input single output Rician fading channel, i.e., overloading ratio is 1.5.

    DOI: 10.1109/VTCSpring.2019.8746451

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  • Coded Quadrature Amplitude Modulations For XOR Physical Layer Network Coding With Precoding. Reviewed

    Satoshi Denno, Kazuma Yamamoto, Yafei Hou

    2019 22nd International Symposium on Wireless Personal Multimedia Communications (WPMC)   1 - 6   2019

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    DOI: 10.1109/WPMC48795.2019.9096064

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  • Optical Radio Channel Propagation in Wireless Communication Systems with LEDs Reviewed

    Satoshi Denno, Shunsuke Fujitaka, Yafei Hou, Shigeru Tomisato, Kazuhiro Uehara

    2019 12TH GLOBAL SYMPOSIUM ON MILLIMETER WAVES (GSMM 2019)   50 - 52   2019

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    This paper analyzes optical radio channel propagation characteristics by means of experimental measurement. The channel with an LED and a PD provided by the outstanding technologies co. ltd., is defined as an optical radio channel, and its delay profile is measured by NI-USRPs. As a result, small delayed paths are detected due to the LED or the PD in use. The delay profile is evaluated in a system with single carrier modulation where the frequency domain equalization is applied, in terms of the bit error rate (BER). The transmission performance is about 2dB degraded due to the small delayed paths.

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  • Machine Learning-based RSSI Prediction in Factory Environments. Reviewed

    Julian Webber, Norisato Suga, Susumu Ano, Yafei Hou, Abolfazl Mehbodniya, Toshihide Higashimori, Kazuto Yano, Yoshinori Suzuki

    2019 25th Asia-Pacific Conference on Communications (APCC)   195 - 200   2019

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    DOI: 10.1109/APCC47188.2019.9026476

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  • Time-Domain Signal Recovery for OFDM System in the Industrial Environment Reviewed

    Chengbo Liu, Na Chen, Yafei Hou, Minoru Okada

    2019 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA ASC)   1847 - 1851   2019

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    This paper will utilize a method to recover the damaged time-domain signal of the OFDM system over the WLAN channel in the industrial environment. We assume that the channel is perfectly detected. The simulated results show that the OFDM system using M-algorithm can achieve better BER performance compared to that of the conventional OFDM system in the AWGN channel when 1/2 time-domain signal is missing. On the other hand, the BER performance of the OFDM system with M-algorithm using ZF is better than that of the conventional OFDM system when 1/4 and 1/2 time-domain signal is missing in the WLAN channel. In addition, the BER performance of the OFDM system with M-algorithm using MMSE is better than that of the OFDM system with M-algorithm using ZF in the WLAN channel when 1/8, 1/4 and 1/2 time-domain signal is missing.

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  • Relay Selection for Bi-directional Relay Systems with XOR-Phisical Layer Network Coding Reviewed

    Kazuma Yamamoto, Satoshi Denno, Yafei Hou

    2019 IEEE VTS ASIA PACIFIC WIRELESS COMMUNICATIONS SYMPOSIUM (APWCS 2019)   1 - 5   2019

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    XOR-physical layer network coding is known to achieve superior performance in terms of an end-to-end throughput and frequency utilization efficiency. This paper proposes a novel relay selection technique to further improve transmission performance. We introduce a relay selection criteria that is defined as an end-to-end BER performance in the relay network. The proposed technique select a group of relays that maximizes the criteria. This paper applies lattice reduction-aided precoding in order to improve the transmission performance and to reduce computational complexity of the relay selection. The performance of the proposed relay selection is evaluated in a 2x2 MIMO bidirectional wireless relay system. The proposed selection attains a gain of about 13dB at the BER of 10(-4).

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  • Single weakly tilted FBG in 2-μm band capable of measuring temperature, axial strain, and surrounding refractive index

    Dan Cheng, Fengping Yan, Ting Feng, Zhuoya Bai, Luna Zhang, Wei Wang, Shuo Liu, Hong Zhou, Yafei Hou

    Optical Engineering   57 ( 9 )   2018.9

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    Optical fiber devices and applications in the 2-μm band have been investigated extensively due to its unique advantages, such as eye safety. A fiber sensor based on tilted fiber Bragg grating with a grating plane angle of 2 deg is fabricated and experimentally tested. To the best of the authors' knowledge, this is the first tilted fiber Bragg grating sensor to realize simultaneous measurements of temperature, axial strain, and a certain range of surrounding refractive index (SRI) at the 2-μm band. This paper uses the wavelength detection method and selects three independent resonant wavelengths as the investigated parameters. Results show that perturbations of temperature, axial strain, and SRI can shift the wavelengths of the core mode resonance and cladding mode resonance to some degree. The temperature sensitivities of the core mode and cladding mode are nearly the same, but their axial-strain sensitivities are different. Furthermore, the core mode is insensitive to the change in SRI. The sensitivities of SRI, temperature, and strain can thus be obtained by experimentally determining the wavelength shifts of the three independent resonance peaks. A 3 × 3 matrix containing the relationship coefficients between the disturbances of temperature, axial strain, and SRI and wavelength shifts is constructed. By reversely solving the matrix equation, variations in temperature, strain, and SRI can be obtained using the experimental determination of wavelength drifts.

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  • Ultrasensitive sensing with three-dimensional terahertz metamaterial absorber Reviewed

    Siyu Tan, Fengping Yan, Wei Wang, Hong Zhou, Yafei Hou

    JOURNAL OF OPTICS   20 ( 5 )   2018.5

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    Planar metasurfaces and metamaterial absorbers have shown great promise for label-free sensing applications at microwaves, optical and terahertz frequencies. The realization of high-qualityfactor resonance in these structures is of significant interest to enhance the sensing sensitivities to detect minute frequency shifts. We propose and demonstrate in this manuscript an ultrasensitive terahertz metamaterial absorber sensor based on a three-dimensional split ring resonator absorber with a high quality factor of 60.09. The sensing performance of the proposed absorber sensor was systematically investigated through detailed numerical calculations and a maximum refractive index sensitivity of 34.40% RIU-1 was obtained. Furthermore, the absorber sensor can maintain a high sensitivity for a wide range of incidence angles up to 60 degrees under TM polarization incidence. These findings would improve the design flexibility of the absorber sensors and further open up new avenues to achieve ultrasensitive sensing in the terahertz regime.

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  • Safeguarding 5G Networks through Physical Layer Security Technologies Reviewed

    Li Sun, Kamel Tourki, Yafei Hou, Lu Wei

    WIRELESS COMMUNICATIONS & MOBILE COMPUTING   2018   7503735 - 2   2018

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    DOI: 10.1155/2018/7503735

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  • Partial Layered Division Multiplexing with STBC for ISDB-T and Next Generation DTTB Systems Reviewed

    Ryan Paderna, Yafei Hou, Duong Quang Thang, Takeshi Higashino, Minoru Okada

    ITE TRANSACTIONS ON MEDIA TECHNOLOGY AND APPLICATIONS   6 ( 1 )   98 - 109   2018

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    In order to realize next generation digital terrestrial television broadcasting (DTTB) systems, the currently deployed Integrated Services Digital Broadcasting Terrestrial (ISDB-T) is still essential due to the spectrum-scarcity. This paper proposes a layered division multiplexing (LDM) scheme to simultaneously transmit ISDB-T stream and a secondary data stream over a common frequency band. The next generation DTTB system can be obtained by combining the ISDB-T and the secondary data streams. In the proposed scheme, we deploy the primary layer for transmission of ISDB-T signal and the secondary layer for transmission of secondary data stream both employed space time block coding. In addition, we only adopt partial LDM to reduce the interference between two systems, since the transmission capacity of the secondary layer exceeded the minimum requirement due to reuse of primary layer.

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  • Low-complexity Power Allocation with Positional Information for 4-by-4 MIMO Channel using One Composite Leaky Coaxial Cable Reviewed

    Junjie Zhu, Yafei Hou, Satoshi Denno, Minoru Okada

    2018 IEEE 7TH GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE 2018)   841 - 842   2018

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    Leaky coaxial (LCX) cable can be used as antenna for wireless communication system and wireless power transfer which can be widely applied for many application scenarios including wireless service for IoT, automated factory using a large number of wireless devices. We have designed that one LCX cable can be used as two antennas which can releases the space requirement of MIMO deployment for wireless application. In this paper, we will further evaluate the 4-by-4 LCX-MIMO channel using one composite cable with two LCX cables. In addition, we also propose a low-complexity power allocation method for the LCX-MIMO system with the user's positional information (PI). The results show that the capacity is promising when the spacing between LCX cables is small as to 2cm. In addition, our proposed low-complexity power allocation has better capacity than that of using equal power allocation when SNR value is over the low range.

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  • Performance Analysis of Low complexity Lattice Reduction-aided Iterative Receiver for Overloaded MIMO Reviewed

    Satoshi Denno, Yuta Kawaguchi, Tsubasa Inoue, Hou Yafei

    2018 12TH INTERNATIONAL CONFERENCE ON SIGNAL PROCESSING AND COMMUNICATION SYSTEMS (ICSPCS)   1 - 5   2018

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    This paper proposes a novel low complexity lattice reduction-aided iterative receiver for overloaded MIMO. Novel noise cancellation is proposed that increases an equivalent channel gain with a scalar gain introduced in this paper, which results in the improvement of the signal to noise power ratio (SNR). The performance of the proposed receiver is theoretically analyzed that the lattice reduction guarantees the SNR of the detector to be more than a value proportional to the scalar gain, when the LenstraLenstraLovas (LLL) algorithm is applied to implement the lattice reduction. The proposed receiver attains a gain of about 5dB at the BER of 10(-4) in a 6 x 2 overloaded MIMO channel.

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  • Adaptive Sideband Selection for Periodic Interference Cancellation Reviewed

    Yuya Kimura, Satoshi Denno, Yafei Hou

    2018 ASIA-PACIFIC MICROWAVE CONFERENCE PROCEEDINGS (APMC)   156 - 158   2018

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    This paper proposes adaptive sideband selection for periodic interference cancellation using digital signal processing. The proposed selection enables the periodic interference cancellation to attain better performance by providing sideband signals having higher ICNR(interference to carrier and noise power ratio). An algorithm that selects such sideband signals is shown in this paper. The proposed selection achieves 18dB better SINR(output signal to interference and noise power ratio) performance than random selection in the channel with CIR(carrier to interference power ratio) of 10dB and CNR(carrier to noise power ratio) of 30dB.

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  • Busy/Idle Duration Model for WLAN Traffic and Its Prediction Performance using Autoregressive Method Reviewed

    Yafei Hou, Yusuke Tanaka, Julian Webber, Kazuto Yano, Satoshi Denno, Tomoaki Kumagai

    2018 ASIA-PACIFIC MICROWAVE CONFERENCE PROCEEDINGS (APMC)   893 - 895   2018

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    This paper will study the busy/idle duration model and its prediction performance of autoregressive (AR) based predictor using the real environment data collected during rush-hour weekday evening at a railway station. The analysis shows that both busy and idle duration distribution largely appear as a generalized Pareto (GP) distribution with a different scale value. In addition, the scale value highly decides the prediction performance of the low-complexity linear AR based predictor. We also propose a new AR based predictor by separating busy/idle duration data into different streams to differentiate the scale value of the streams. The prediction performance of the proposed predictor can be improved for the streams with small scale value.

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  • Ultrasensitive terahertz metamaterial sensor based on vertical split ring resonators Reviewed

    Wei Wang, Fengping Yan, Siyu Tan, Hong Zhou, Yafei Hou

    PHOTONICS RESEARCH   5 ( 6 )   571 - 577   2017.12

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    An ultrasensitive metamaterial sensor based on double- slot vertical split ring resonators (DVSRRs) is designed and numerically calculated in the terahertz frequency. This DVSRR design produces a fundament LC resonance with a quality factor of about 20 when the incidence magnetic field component normal to the DVSRR array. The resonant characteristics and sensing performance of the DVSRR array design are systematically analyzed employing a contrast method among three similar vertical split ring resonator (SRRs) structures. The research results show that the elimination of bianisotropy, induced by the structural symmetry of the DVSRR design, helps to achieve LC resonance of a high quality factor. Lifting the SRRs up from the substrate sharply reduces the dielectric loss introduced by the substrate. All these factors jointly result in superior sensitivity of the DVSRR to the attributes of analytes. The maximum refractive index sensitivity is 788 GHz/RIU or 1.04 x 10(5) nm/RIU. Also, the DVSRR sensor maintains its superior sensing performance for fabrication tolerance ranging from -4% to 4% and wide range incidence angles up to 50 degrees under both TE and TM illuminations. (C) 2017 Chinese Laser Press

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  • Simultaneous measurement of refractive index and conductivity based on metamaterial absorber

    Wei Wang, Feng-Ping Yan, Si-Yu Tan, Lu-Na Zhang, Zhuo-Ya Bai, Dan Cheng, Hong Zhou, Ya-Fei Hou

    Journal of Optics (United Kingdom)   19 ( 11 )   2017.10

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    An algorithm for the metamaterial sensors to simultaneously measure the refractive index (RI) and conductivity of the analyte is introduced. To verify the algorithm, a square ring metamaterial absorber is numerically calculated as a specific example in the terahertz frequency. Firstly, the sensing performances of the absorber on the RI and conductivity are evaluated separately. Then the relationship expressions between dual variables (frequency shift (FS) and amplitude modulation (AM)) and two arguments (RI and conductivity) can be obtained through mathematical fitting process. By reversely solving this equations set, the conductivity and RI of the analyte can be expressed as another equations set that can be solved easily. The proposed algorithm offers an effective method to determine RI and conductivity of the analyte by measuring the AM and FS of the reflection dip of the absorber sensor. To validate the effectiveness and accuracy of the algorithm, the FS and AM obtained from the simulations are plugged into the reverse equations set. Then the calculated n and σ are compared to their responding original values. The maximum percentage error between them are both less than 0.83%, which are small enough to illustrate the rightness of the proposed method.

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  • Research on transmission characteristics of phase-shifted CFBG in 2 mu m band Reviewed

    Luna Zhang, Fengping Yan, Zhuoya Bai, Yan Bai, Shuo Liu, Hong Zhou, Yafei Hou, Ning Zhang

    OPTICAL FIBER TECHNOLOGY   36   428 - 437   2017.7

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    Principles of single-and multi-phase-shifted chirped fiber Bragg grating (CFBG) in 2 mu m band are analyzed with transmission matrix method, and transmission characteristics, including transmissivity, wavelength and bandwidth performance, of single-and multi-phase-shifted CFBG in 2 mu m band with different grating parameters are discussed by simulation. It is found that phase-shifted position, grating length, chirped coefficient and refractive index modulation amplitude all have impacts on bandwidth of phase-shifted transmission peak. The transmission peak bandwidths of single-, dual-and tri-phase-shifted CFBG can reach to 0.0270, 0.0172 and 0.0112 nm respectively. The experiment of phase-shifted CFBG verifies the correctness of the simulation, and the bandwidths of 0.0901 and 0.0480 nm are acquired for single-and dual-phase-shifted CFBG respectively, which are narrower than previous filters based on fiber Bragg grating in 2 mu m band multi-wavelength fiber laser system. (C) 2017 Elsevier Inc. All rights reserved.

    DOI: 10.1016/j.yofte.2017.06.001

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  • 2-mu m numerical analysis of linear-cavity FP structures based on fiber Bragg gratings Reviewed

    Zhuoya Bai, Fengping Yan, Luna Zhang, Yan Bai, Shuo Liu, Hong Zhou, Yafei Hou, Ning Zhang

    OPTICAL ENGINEERING   56 ( 5 )   2017.5

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    The linewidth performance of all-fiber, linear-cavity Fabry-Perot structures based on fiber Bragg gratings operating at 2-mu m band has been investigated numerically. The output linewidth performance of two symmetrical and asymmetrical cavities has been theoretically studied and comprehensively compared. The numerical analysis is based on the transmission matrix method with the simplified parameters. The simulation results show that cavity lengths, cavity lengths ratio, grating lengths, grating lengths ratio, as well as index modulation depths, affect the output linewidth performance. The tolerance ability of the asymmetrical structure is first proposed and investigated under 1 mm accuracy, and single-frequency output can be realized by properly adjusting the properties of the proposed composite linear cavity structure. (C) 2017 Society of Photo-Optical Instrumentation Engineers (SPIE)

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  • Single-polarization noise-like pulse generation from a hybrid mode-locked thulium-doped fiber laser Reviewed

    Shuo Liu, Feng-Ping Yan, Ting Feng, Lu-Na Zhang, Zhuo-Ya Bai, Hong Zhou, Yafei Hou, Ning Zhang

    JOURNAL OF OPTICS   19 ( 4 )   2017.4

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    A hybrid mode-locked thulium-doped fiber laser incorporating a nonlinear optical loop mirror and a nonlinear polarization rotation effect is proposed in the 2 mu m band for the first time. By adjusting two polarization controllers, a stable single-polarization noise-like (SPNL) pulse operation is obtained. The SPNL pulse could work steadily for at least 400 min. At a launched pump power of 3.52 W, the hybrid mode-locked SPNL pulse centers at 2007 nm with an optical full width at half maximum of 20 nm, a polarization extinction ratio of 26.3 dB, a coherence spike width of 258 fs and a pulse energy of 42.11 nJ, respectively.

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  • Switchable SP Dual-Wavelength Mode-Locked TDFL Incorporating a PM-FBG and SESAM Reviewed

    Shuo Liu, Fengping Yan, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou, Ning Zhang

    IEEE PHOTONICS TECHNOLOGY LETTERS   29 ( 6 )   551 - 554   2017.3

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    A switchable single-polarization (SP) dualwavelength mode-locked thulium-doped fiber laser using the polarization maintaining fiber Bragg grating and semiconductor saturable absorber mirror is proposed in 2-mu m band. By adjusting the polarization controller, stable dual-wavelength pulse lasing operation and SP single-wavelength pulse lasing operation are obtained. The dual-wavelength pulse lasing operation is obtained at 1940.97 and 1941.73 nm. In the SP single-wavelength pulse lasing state, the polarization extinction ratios are higher than 30 dB, the SP pulse duration are 3.75 and 3.73 ps.

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  • Low-Complexity Compressed Sensing-Based Channel Estimation With Virtual Oversampling for Digital Terrestrial Television Broadcasting Reviewed

    Ryan Paderna, Duong Quang Thang, Yafei Hou, Takeshi Higashino, Minoru Okada

    IEEE Transactions on Broadcasting   63 ( 1 )   82 - 91   2017.3

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    This paper proposes a low-complexity compressed sensing (CS)-based time domain channel estimation with virtual oversampling for OFDM-based DTTB system. CS technique is first applied to sparse channel estimation in integrated services digital broadcasting-terrestrial (ISDB-T) system. Unfortunately, the CS-based time-domain channel estimation suffers from a performance degradation under the existence of fractional delay. Fractional delay is a common issue in time domain-based channel estimation due to sampling imperfection of channel delay time. Therefore, we propose virtual oversampling to deal with the fractional delay without increasing the signal bandwidth. Furthermore, exploiting the fact that the rate of change of path delay is slower than the path gain, a modified orthogonal matching pursuit is also proposed to reduce computational complexity. Numerical analyses of bit error rate and computational complexity are given to verify effectiveness of the proposed scheme.

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  • A Low-Complexity Hardware Implementation of Compressed Sensing-Based Channel Estimation for ISDB-T System Reviewed

    Rian Ferdian, Yafei Hou, Minoru Okada

    IEEE Transactions on Broadcasting   63 ( 1 )   92 - 102   2017.3

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    Compressed sensing (CS) is one of the hottest research topics in the sparse signal reconstruction problem. But CS implementation has a drawback of high computational complexity due to calculation between large size of matrices. In this paper, we will propose a low-complexity CS hardware realization for channel estimation in the integrated services digital broadcasting-terrestrial (ISDB-T) system using several optimization methods to reduce the implementation complexity of CS usage. Since the ISDB-T is based on orthogonal frequency division and multiplexing system, the measurement matrix of CS computation is a truncated discrete Fourier transform (DFT) matrix. We can exploit the symmetrical property of this DFT matrix to significantly reduce its multiplication complexity and random access memory usage. To achieve fast reconstruction period, this paper also provides a hardware architecture for the proposed method and its realization in field programmable gate array. The simulation results show that the proposed methods can achieve lower complexity CS-based channel estimation with almost the identical system performance with the conventional method. Moreover, the realized hardware can achieve the fastest execution time compare to that of other existing methods.

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  • Stability wavelength-spacing-tunable single-longitudinal-mode dual-wavelength erbium-doped fiber laser based on nonlinear amplifying loop mirror Reviewed

    Shuo Liu, Fengping Yan, Siyu Tan, Yan Bai, Chang Fei, Hong Zhou, Yafei Hou, Ning Zhang

    OPTICAL AND QUANTUM ELECTRONICS   49 ( 1 )   2017.1

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    A simple linear cavity configuration for a stability wavelength-spacing-tunable single-longitudinal-mode (SLM) dual-wavelength erbium-doped fiber laser based on a nonlinear amplifying loop mirror (NALM) is proposed. The gain competition in the erbium-doped fiber (EDF) has been suppressed by the intensity dependent loss introduced by the NALM. The SLM operation is guaranteed by a section of unpumped EDF as saturable absorber. A stable dual-wavelength SLM fiber laser with a wavelength-spacing of 11.35 nm is experimentally realized. The optical signal-to-noise ratio is over 47 dB and the linewidths of two wavelengths measured by delayed self-heterodyne method are 1.1 and 1.0125 kHz, respectively. The tuning range of wavelength-spacing is 9.09-11.35 nm, correspondingly, and the THz signal is from 1.235 to 1.416 THz.

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  • Study on Idle Slot Availability Prediction for WLAN using a Probabilistic Neural Network Reviewed

    Julian Webber, Abolfazl Mehbodniya, Yafei Hou, Kazuto Yano, Tomoaki Kumagai

    2017 23RD ASIA-PACIFIC CONFERENCE ON COMMUNICATIONS (APCC): BRIDGING THE METROPOLITAN AND THE REMOTE   162 - 167   2017

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    We have recently proposed a multi-band wireless local area network (WLAN) system as a solution to the increasingly crowded frequency space. Efficiency can be improved by an agile transceiver that transmits on an idle channel on either or both bands concurrently, and a busy/idle (B/I) predictor will form part of the sensing unit for such a system. A probabilistic neural network (PNN) is studied here for predicting upcoming WLAN B/I status based on pattern matching and classification of previous state patterns. IEEE 802.11 wireless data frames were captured at two hot-spots on multiple channels and the B/I status estimated. The prediction performance is compared for two different locations, channels, prediction matrix dimensions, B/I vs channel occupancy ratio (COR) input types, and frequency of retraining. Results show that the PNN has good potential to estimate the number of idle slots in the upcoming 20 slots and the performance improves with regular retraining.

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  • Noise-like pulse generation from a thulium-doped fiber laser using nonlinear polarization rotation with different net anomalous dispersion Reviewed

    Shuo Liu, Fengping Yan, Yang Li, Luna Zhang, Zhuoya Bai, Hong Zhou, Yafei Hou

    PHOTONICS RESEARCH   4 ( 6 )   318 - 321   2016.12

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    A mode-locked thulium-doped fiber laser (TDFL) based on nonlinear polarization rotation (NPR) with different net anomalous dispersion is demonstrated. When the cavity dispersion is -1.425 ps(2), the noise-like (NL) pulse with coherence spike width of 406 fs and pulse energy of 12.342 nJ is generated at a center wavelength of 2003.2 nm with 3 dB spectral bandwidth of 23.20 nm. In the experimental period of 400 min, the 3 dB spectral bandwidth variation, the output power fluctuation, and the central wavelength shift are less than 0.06 nm, 0.04 dB, and 0.4 nm, respectively, indicating that the NPR-based TDFL operating in the NL regime holds good long-term stability. (C) 2016 Chinese Laser Press

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  • Low-Complexity Channel Estimation and Detection for MIMO-OFDM Receiver With ESPAR Antenna Reviewed

    Diego Javier Reinoso Chisaguano, Yafei Hou, Takeshi Higashino, Minoru Okada

    IEEE Transactions on Vehicular Technology   65 ( 10 )   8297 - 8308   2016.10

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    Multiple-input-multiple-output orthogonal frequency-division multiplexing (MIMO-OFDM) receivers with an electronically steerable passive array radiator (ESPAR) antenna can improve bit error rate (BER) performance and obtain additional diversity gain without increasing the number of radio-frequency (RF) front-end circuits. In this scheme, a minimum-mean-square-error (MMSE) channel estimator is employed for obtaining the channel state information. However, its drawbacks include insufficient estimation accuracy and high computational complexity due to the inverse matrix calculation. In this paper, we propose using a low-complexity compressed-sensing-based channel estimation for the MIMO-OFDM receiver with an ESPAR antenna. We also propose a low-complexity detection scheme to further reduce the computational cost required for the detection. The simulation results show that with using the proposed channel estimation method, the BER performance is improved, while its complexity is reduced. The simulations also show that the proposed detection scheme successfully reduces the required computational cost while minimizing the degradation in the BER.

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  • Quality-Based Channel Allocation Scheme with Predistortion in Multi-Channel Radio over Fiber System Reviewed

    Withawat Tangtrongpairoj, Yafei Hou, Takeshi Higashino, Minoru Okada

    IEICE TRANSACTIONS ON ELECTRONICS   E99C ( 5 )   563 - 573   2016.5

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    Radio over Fiber (RoF) is a promising solution for providing wireless access services. Heterogeneous radio signals are transferred via an optical fiber link using an analog transmission technique. When the RoF and the radio frequency (RF) devices have a nonlinear characteristic, these will create the intermodulation products (IMPs) in the system and generate the intermodulation distortion (IMD). In this paper, the IMD interference in the uplink RF signals from the coupling effect between the downlink and the uplink antennas has been addressed. We propose a method using the dynamic channel allocation (DCA) algorithm with the predistortion (PD) technique to improve the throughput performance of the multi-channel RoF system. The carrier to distortion plus noise power ratio (CDNR) is evaluated for all channel allocation combinations; then the best channel combination is assigned as a set of active channels to minimize the effect of IMD. The results show that the DCA with PD has the lowest IMD and obtains a better throughput performance.

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  • A Proposal of Wireless Sensor Network System for Slope Failure Detection Using Smartphones

    Yafei Hou, Manato Fujimoto, Hirohiko Suwa, Yutaka Arakawa, Julian Webber, Kazuto Yano, Satoshi Tsukamoto, Tomoaki Kumagai(ATR, Michinori Hatayama, Kyoto, Uni

    The 2016 Vietnam-Japan International Symposium on Antennas and Propagation   2016.2

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  • Downhill: BLE-based Multi-Hop Communication Using Smartphones for Detecting Slope Failures Reviewed

    Manato Fujimoto, Seigi Matsumoto, John Noel Victorino, Hirohiko Suwa, Yutaka Arakawa, Yafei Hou, Julian Webber, Kazuto Yano, Satoshi Tsukamoto, Michinori Hatayama

    The 17th International Workshop on Mobile Computing Systems and Applications (ACM HotMobile 2016)   16 - 21   2016.2

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    DOI: 10.1109/ICPPW.2016.18

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  • Fast and Low-complexity Orthogonal Matching Pursuit Based Channel Estimation in ISDB-T Receiver with 3-element ESPAR Antenna Reviewed

    Rian Ferdian, Yafei Hou, Minoru Okada

    2016 IEEE INTERNATIONAL SYMPOSIUM ON BROADBAND MULTIMEDIA SYSTEMS AND BROADCASTING (BMSB)   1 - 4   2016

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    In a mobile integrated service digital broadcasting-terrestrial (ISDB-T) system, the usage of a 3-elements electrical steerable parasitic array radiator (ESPAR) antenna can be a solution to gain diversity while keeping low power consumption and compact hardware size. But, the ESPAR antenna also increases the channel estimation difficulty as the received signal from each element will interfere each others. Orthogonal matching pursuit (OMP) can become an alternative in obtaining channel information for the system with ESPAR antenna. However, the OMP technique has a drawback in huge matrix inner product in its computation. In this paper, we propose a 3-column OMP with measurement matrix strength reduction technique to reduce the complexity in the inner product computation. The propose method overall result can achieve more than 90% complexity reduction.

    DOI: 10.1109/BMSB.2016.7521988

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  • A Proposal of Half-Symbol Parallel Combinatory Multicarrier Modulation for One-Seg Service of ISDB-T System Reviewed

    Chengbo Liu, Yafei Hou, Takeshi Higashino, Minoru Okada

    2016 IEEE INTERNATIONAL SYMPOSIUM ON BROADBAND MULTIMEDIA SYSTEMS AND BROADCASTING (BMSB)   1 - 4   2016

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    One-Seg service is a mobile terrestrial digital audio/video and data broadcasting service in Japan and many other countries. It transmits QPSK modulated symbols to achieve about 416 kbit/s transmission rate for mobile receivers with 428 kHz of bandwidth at UHF band. To further improve the transmission quality and spectrum efficiency, the system design must consider some major issues such as performance degradation from large Doppler shift and small size hardware for receivers which limit the system only to use low-order M-QAM modulation like BPSK or QPSK and small size of power amplifier with a low dynamic range of peak-to-average power ratio (PAPR). To reduce these impacts on the performance of One-Seg service, this paper proposes a BPSK modulated multicarrier system using parallel combinatory (PC) code. The proposed system achieves better BER performance and better PAPR characteristics with a comparable bandwidth efficiency (BWE) compared to that of the corresponding M-QAM modulated OFDM systems.

    DOI: 10.1109/BMSB.2016.7521993

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  • Diversity Gain Analysis of SFN-STBC Digital Terrestrial TV System Using Dual Polarized MIMO Antenna Reviewed

    Ryan Paderna, Duong Quang Thang, Yafei Hou, Takeshi Higashino, Minoru Okada

    2016 IEEE INTERNATIONAL SYMPOSIUM ON BROADBAND MULTIMEDIA SYSTEMS AND BROADCASTING (BMSB)   1 - 4   2016

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    This paper proposes a Modified Orthogonal Matching Pursuit (MOMP)-assisted MIMO-OFDM receiver for next generation DTTV with Single Frequency Network- Space Time Block Coding (SFN-STBC). The receiver uses dual polarized antennas which can receive signals from different transmitters. In this paper, we investigate the BER performance if the transmitters transmit signals with different signal power where the receiver is in near-far effect with different receive power from different transmitter. In addition, we also examine the performance of the SFN system using MOMP for channel estimation with near-far effect. The simulation shows that the BER decreases if the received signal power from different transmitters are almost equal. And also, the MOMP BER performance is about 1 dB closer compared to ideal channel information in the range of SNR Eb/No=l5dB to Eb/No=25dB region.

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  • Orthogonal Parallel Combinatory Amplitude Shift Keying Modulated Multicarrier System Reviewed

    Chengbo Liu, Yafei Hou, Takeshi Higashino, Minoru Okada

    2016 16TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES (ISCIT)   7 - 10   2016

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    For some scenarios where high received power cannot be guaranteed due to user moving, the OFDM system with low order M-QAM such as BPSK/QPSK is promising. This paper will propose an orthogonal parallel combinatory ASK modulated multicarrier system to achieve flexible bandwidth efficiency (BWE) using low order ASK modulation and parallel combinatory (PC) code. PC code has been shown that it can achieve flexible BWE and better peak-to-average power ratio (PAPR) performance. Our proposal will utilize PC code for both I-phase and Q-phase of frequency-domain OFDM symbol which further improve the BWE of PC-OFDM system. The proposed system can obtain better BER performance and better PAPR performance using low order ASK modulation. Therefore, the proposed system can simplify the receiver design and provide the design freedom degree with a flexible range of BWE for system design or adaptive modulation and code control.

    DOI: 10.1109/ISCIT.2016.7751581

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  • Compressed Sensing Based Channel Estimation in ISDB-T System without Cyclic Prefix

    FERDIAN Rian, HOU Yafei, OKADA minoru

    ITE Technical Report   40   29 - 32   2016

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    Integrated Service Digital Broadcasting Terrestrial (ISDB-T) transmission system is based on OFDM technique which requires cyclic prefix (CP) and pilot tones for channel estimation. Beside data sub-carriers, the usage of CP and pilot tones occupies the ISDB-T bandwidth up to 25%. However, CP is required to mitigate the inter-symbol interference (ISI) and interblock interference (IBI) and pilot tones are required to estimate the channel response information in order to equalize the multipath effect. Recently, a wireless communication scheme without CP by using chained turbo of equalization (CHATUE) technique was proposed. Furthermore, in term of channel estimation, compressed sensing (CS) has become a prominent technique that offers better performance with less pilot tones. In this paper, we proposed a channel estimation scheme for ISDB-T system without CP using CS technique. The pilot tones are inserted at several lowest value intersections location in the previous and post symbol interferences. The final result provides an ISDB-T system with more than 90% spectrum efficiency.

    DOI: 10.11485/itetr.40.4.0_29

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  • Compressed Sensing based Channel Impulse Response Estimation for Space Time Block Coding Single Frequency Network in DTV System

    PADERNA Ryan, THANG Duong Quang, HOU Yafei, HIGASHINO Takeshi, OKADA Minoru

    ITE Technical Report   40   21 - 24   2016

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    This system uses a low complexity channel estimation for Space Time Coding in a Single Frequency Network Digital Terrestrial Television System. The receiver employs a MIMO system with vertical and horizontal antennas. The channel estimator uses a compressed sensing in time domain which exploits the sparsity of the channel impulse response. The algorithm for estimating the delay and channel gain is Orthogonal Matching Pursuit (OMP). The BER performance shows that OMP is very close to the ideal channel estimation. In addition, the OMP performance outperforms the linear interpolation method.

    DOI: 10.11485/itetr.40.4.0_21

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  • Erratum: Quality-Based Channel Allocation Scheme with Predistortion in Multi-Channel Radio over Fiber System [IEICE Transactions on Electronics Vol. E99.C (2016) No. 5 pp. 563-573]

    TANGTRONGPAIROJ Withawat, HOU Yafei, HIGASHINO Takeshi, OKADA Minoru

    IEICE Transactions on Electronics   99 ( 10 )   1226_e1 - 1226_e1   2016

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    DOI: 10.1587/transele.E99.C.1226_e1

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  • Realization of 4-by-4 MIMO Channel Using One Composite Leaky Coaxial Cable Reviewed

    Yafei Hou, Satoshi Tsukamoto, Takahiro Maeda, Masayuki Ariyoshi, Kiyoshi Kobayashi, Tomoaki Kumagai, Atsuhiko Niwa, Fumio Suzuki, Minoru Okada

    2015 12TH ANNUAL IEEE CONSUMER COMMUNICATIONS AND NETWORKING CONFERENCE   97 - 102   2015

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    Leaky coaxial cable (LCX) is widely used for wireless communication systems as an antenna for a linear-cell, which covers long and shallow areas. Since one LCX is usually utilized as one antenna, more than one LCX is required to configure a multi-input multi-output (MIMO) system. It means it is costly and space-consuming. To resolve these problems, we proposed a novel MIMO method for LCX. In this paper, we propose the method to utilize one composite cable, which consists of a pair of LCXs with different radiation characteristics, to configure a 4 x 4 MIMO channel. The measurement results confirmed that the proposed composite cable can realize a good channel condition for 4 x 4 MIMO transmission even if it is put in an anechoic chamber where no reflection path exists. On the other hand, the results also confirmed that it has good channel condition even if the spacing between a pair of LCX is as small as 2cm for the SGHz band. Therefore the proposed system can reduce the space requirement for MIMO deployment for wireless application over linear-cell environments to cope with the high rapid increase of consumer electronics devices.

    DOI: 10.1109/CCNC.2015.7157953

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  • Improved Compressed Sensing based Channel Estimation for Terrestrial DTV using Auxiliary Pilot Channel Reviewed

    Ryan Paderna, Yafei Hou, Takeshi Higashino, Minoru Okada

    2015 15TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES (ISCIT)   213 - 216   2015

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    This paper proposed a scattered auxiliary channel subcarriers for OFDM as additional pilots. This will improve the performance of compressed sensing based channel estimation for digital terrestrial TV. The auxiliary channel is designed to convey additional information on modulating signal transmission. The simulation shows that the proposed system has less bit-error-rate compared with the system without scattered auxiliary channel subcarriers. That is because the channel estimation will detect the correct position of the channel impulses with sufficient pilots.

    DOI: 10.1109/ISCIT.2015.7458345

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  • A Study of Capacity of 4-by-4 MIMO Channel Using Leaky Coaxial Cables for Linear-cells Reviewed

    Sha Li, Yafei Hou, Takeshi Higashino, Minoru Okada

    2015 15TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES (ISCIT)   253 - 256   2015

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    Leaky coaxial (LCX) cable is widely used in wireless transmission communication systems as antenna for a long and narrow area called as linear-cell. We have proposed that one single LCX cable can be used as two antennas and the method to utilize one composite cable, which consists of a pair of LCXs with different radiation characteristics, to configure a multiple input and multiple-output (MIMO) system. In this paper, we will study capacity of the proposed 4-by-4 LCX-MIMO system and compare its capacity with conventional MIMO system using omnidirectional antennas over 2.4GHz band. We also investigate the capacity difference if the spacing of two LCX cable is changed over 5GHz band. The results over 2.4GHz band show that the proposed system can reduce the space requirement for MIMO deployment for wireless application over linear-cell environments. The capacity results show that proposed LCX-MIMO channel has larger capacity than that of using monopole antennas at both sides. Over 5GHz band, the proposed LCX-MIMO channel using WF allocation scheme can have the capacity near to that of independent and identically distributed (i.i.d.) channel. It has good channel capacity even if the spacing between the pair of LCXs is as small as 2cm. On the other hand, the capacity can be largely improved using the simple EP allocation scheme if the system utilize LCX cables to configure MIMO systems for both 2.4GHz and 5GHz bands.

    DOI: 10.1109/ISCIT.2015.7458355

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  • Effective VLSI Architecture for Compressed Sensing Based Channel Estimation in ISDB-T System Reviewed

    Rian Ferdian, Yafei Hou, Minoru Okada

    2015 15TH INTERNATIONAL SYMPOSIUM ON COMMUNICATIONS AND INFORMATION TECHNOLOGIES (ISCIT)   273 - 276   2015

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    Compressed Sensing (CS) based channel estimation has been proven to give a better reconstruction results compared to conventional method. Despite promising a better result, CS based channel estimation still suffers from high complexity computations due to huge matrix multiplication and matrix inversion operations. This paper will propose an effective CS based channel estimation VLSI architecture for ISDB-T system. Since ISDBT system is using orthogonal frequency division multiplexing (OFDM) technique for its transmission, its CS channel estimation will utilize a measurement matrix which is formed by parts of Discrete Fourier Transform (DFT) matrix. By exploiting the fact that the measurement matrix will inherit some symmetrical properties from DFT matrix, we can achieve a low complexity CS based channel estimation for practical implementation.

    DOI: 10.1109/ISCIT.2015.7458360

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  • Configuration of MIMO system using single leaky coaxial cable for linear cell environments Reviewed

    Yafei Hou, Satoshi Tsukamoto, Takahiro Maeda, Masayuki Ariyoshi, Kiyoshi Kobayashi, Tomoaki Kumagai, Minoru Okada

    IEICE COMMUNICATIONS EXPRESS   4 ( 5 )   143 - 148   2015

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    It has been conventionally assumed that a single leaky coaxial (LCX) cable only is utilized as one antenna to configure a multiple-input multiple-output (MIMO) system. In this letter, we show one single LCX cable can be used as two antennas to configure a MIMO system owing to the designed intersection angle between the different radiation directivities of both input signals. The measurement results of 2 x 2 LCX-MIMO channel quality confirm that our proposed LCX-MIMO can realize a promising channel condition over 5 GHz frequency band. It also points out that the intersection angle between radiation directivities of LCX cable needs to be considered carefully to reduce the channel degradation at the both edge portions of the LCX cable.

    DOI: 10.1587/comex.4.143

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  • [Paper] ISDB-T Diversity Receiver using a 4-element ESPAR Antenna with Periodically Alternating Directivity

    Reinoso Chisaguano Diego Javier, Hou Yafei, Higashino Takeshi, Okada Minoru

    ITE Transactions on Media Technology and Applications   3 ( 4 )   268 - 278   2015

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    Antenna diversity is one of the solutions to multipath fading but with the cost of additional hardware for every RF chain. In mobile reception application, it is difficult to install the additional antennas and cables to the vehicle due to limitations in installation cost and features. In this paper, we propose an Integrated Services Digital Broadcasting - Terrestrial (ISDB-T) diversity receiver using a 4-element electronically steerable passive array radiator (ESPAR) antenna with periodically alternating directivity. The proposed receiver obtains diversity gain requiring only a single-RF front-end and cable, thus reducing the hardware complexity compared to conventional antenna diversity receivers. The receiver utilizes compressed sensing-based channel estimation that recovers the channel state information (CSI) with good accuracy. The simulation results show that with perfect CSI, the proposed ISDB-T receiver is capable of obtaining a diversity gain of about 15 dB for a bit error rate of 10-3.

    DOI: 10.3169/mta.3.268

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  • Introducing Dual Regularization Parameters into Regularized Channel Inversion (RCI)-Based Vector Perturbation for Modulo Loss Reduction Reviewed

    Yafei Hou, Satoshi Tsukamoto, Kazuto Yano, Masahiro Uno, Kiyoshi Kobayashi

    2014 16TH INTERNATIONAL CONFERENCE ON ADVANCED COMMUNICATION TECHNOLOGY (ICACT)   361 - +   2014

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    This paper proposes a method to reduce the symbol error caused by modulo operator for regularized channel inversion (RCI)-based vector perturbation (RCI-VP). The proposed method introduces dual regularization parameters of RCI precoding matrix. First regularization parameter alpha(1) is set so as to maximize the signal to interference plus noise ratio (SINR) value of each stream to find the optimal perturbation vector. The second regularization parameter alpha(2) is set so as to minimize the total MSE between the transmitted perturbation vector and received perturbation vector to reduce the symbol error caused by modulo operator. The simulated results confirm that the proposed method can improve the performance of RCI-VP over i.i.d. MIMO channel and frequency-selective fading MIMO channel.

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  • Performance Comparison for 2 by 2 MIMO System Using Single Leaky Coaxial Cable over WLAN Frequency Band Reviewed

    Yafei Hou, Satoshi Tsukamoto, Masayuki Ariyoshi, Kiyoshi Kobayashi, Tomoaki Kumagai, Minoru Okada

    2014 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA)   1 - 5   2014

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    In linear service areas such as a tunnel and along railways, leaky coaxial cable (LCX) is widely used as antenna for radio communication. Usually, one LCX is utilized as one antenna. Therefore it requires more than one LCX to configure an multi-input multi-output (MIMO) system. We have recently proposed a method that one single LCX can be utilized as two antennas by feeding different RF transmit signals to each end of the proposed cable. In this paper, we compare 2x 2 MIMO system performance using the proposed LCX and using conventional monopole antennas over 2.4GHz band for WLAN appliances. The results confirm that our proposed 2x 2 MIMO channel using a single LCX can realize a good channel condition and bit error ratio (BER) performance for MIMO transmission even within a highly correlated propagation condition. On the other hand, it also shows that the proposed LCX MIMO is promising technique for communications over linear-cell environments from the simulated results which considering the path loss and radiation pattern of LCX characteristics.

    DOI: 10.1109/APSIPA.2014.7041735

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  • An Experimental Evaluation of 2x 2 MIMO System Using Closely-Spaced Leaky Coaxial Cables Reviewed

    Satoshi Tsukamoto, Takahiro Maeda, Masayuki Ariyoshi, Yafei Hou, Kiyoshi Kobayashi, Tomoaki Kumagai

    2014 ASIA-PACIFIC SIGNAL AND INFORMATION PROCESSING ASSOCIATION ANNUAL SUMMIT AND CONFERENCE (APSIPA)   1 - 5   2014

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    This paper introduces a two by two multiple-input multiple-output (MIMO) system using two closely-spaced leaky coaxial cables (LCXs). In this LCX-MIMO system, two different types of LCXs are placed in parallel with a narrow spacing, and different RF signals are fed to each of the LCXs from the same side. We show with our experimental results that the proposed LCX-MIMO set up works as well as MIMO transmission specified by the IEEE802.11n standard in the 2.4 GHz ISM band.

    DOI: 10.1109/APSIPA.2014.7041676

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  • 4-by-4 MIMO Channel Using Two Leaky Coaxial Cables (LCXs) for Wireless Applications over Linear-cell Reviewed

    Yafei Hou, Satoshi Tsukamoto, Masayuki Ariyoshi, Kiyoshi Kobayashi, Minoru Okadat

    2014 IEEE 3RD GLOBAL CONFERENCE ON CONSUMER ELECTRONICS (GCCE)   125 - 126   2014

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    We have recently proposed a novel 2 x 2 multipleinput multiple-output (MIMO) system that utilizes a single leaky coaxial cable (LCX) as two antennas. In this paper, we further propose a 4 x 4 MIMO system by combining two LCXs that have different radiation characteristics into one composite cable and evaluate characteristics of the channel with different spacing between the LCXs. Since the different radiation characteristics create different propagation paths, the proposed system with small spacing between LCXs can realize an efficient channel condition for 4 x 4 MIMO transmission. As a result of measurement at 2.4 GHz band, the smaller spacing as to 1 em between LCXs makes better 4 x 4 MIMO channel condition for transmission. This result indicates that the proposed system can reduce the space requirement for system deployment.

    DOI: 10.1109/GCCE.2014.7031177

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  • 2 by 2 MIMO System Using Single Leaky Coaxial Cable for Linear-cells Reviewed

    Yafei Hou, Satoshi Tsukamoto, Masayuki Ariyoshi, Kiyoshi Kobayashi, Minoru Okada

    2014 IEEE 25TH ANNUAL INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR, AND MOBILE RADIO COMMUNICATION (PIMRC)   327 - 331   2014

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    Leaky coaxial cables (LCX) have been widely used as antennas to form linear service areas for radio communication systems. Such services of linear cells have been deployed inside tunnels, along railways, and so on. Usually, one LCX is utilized as one antenna. Therefore it requires more than one LCX to configure an multi-input multi-output (MIMO) system. In this paper, we propose a MIMO system using single LCX, which can be utilized as two antennas. When different RF transmit signals are fed to each end of the proposed cable, single LCX can work as two antennas. To confirm the feasibility of the proposed MIMO system, we conduct experiments to measure the characteristics of 2 x 2 MIMO channel using single LCX. The results confirm that our proposed 2 x 2 MIMO channel using single LCX can realize a good channel condition for MIMO transmission even within a highly correlated propagation condition. The proposed MIMO system using LCX will release the space requirement and reduce the cost of system for configuration of LCX MIMO system especially with large number of LCXs. It benefits the design and configuration of LCX-MIMO system for many scenarios of linear-cell.

    DOI: 10.1109/PIMRC.2014.7136184

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  • Introduction of Dual Regularization Parameters to Improve the Performance of MMSE Based Vector Perturbation Reviewed

    Yafei Hou, Satoshi Sonobe, Satoshi Tsukamoto, Kazuto Yano, Masahiro Uno, Kiyoshi Kobayashi

    2013 15TH INTERNATIONAL CONFERENCE ON ADVANCED COMMUNICATION TECHNOLOGY (ICACT)   558 - 562   2013

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    This paper proposes a method to improve the performance of minimum-mean square error (MMSE) based vector perturbation (MMSE-VP) by introducing dual regularization parameters of MMSE precoding matrix. First regularization parameter alpha(1) is set so as to maximize the signal to interference plus noise ratio (SINR) value of each stream to find the optimal perturbation vector. The second regularization parameter alpha(2) is set as to minimize the total MSE between the transmitted perturbation vector and received perturbation vector to precancel the interference among the streams. The simulated results confirm that the proposed method can improve the performance of MMSE-VP over i.i.d. MIMO channel and indoor correlated frequency-selective fading MIMO channel.

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  • Impact of CSI variation in subband on performance of vector perturbation based MU MIMO-OFDM system

    Hou Yafei, Sonobe Satoshi, Tsukamoto Satoshi, Yano Kazuto, Uno Masahiro, Kobayashi Kiyoshi

    IEICE ComEX   2 ( 3 )   86 - 92   2013

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    Because of limitation of channel state information (CSI) feedback resource, multiuser (MU) MIMO-OFDM system usually divides all usable subcarriers into several subbands and the CSI of middle subcarrier of each subband is fed back. This feedback style generates CSI error among each subband. Due to this CSI error, a MU MIMO-OFDM system based on vector perturbation (VP) yields inefficient perturbation vectors (PVs) and mismatched spatial filters, which cause severe performance degradation. In this letter, we show that the performance degradation is mainly caused from the mismatched spatial filters rather than the inefficient PVs. This result is useful to design of a computational complexity reduction for the VP based system by reducing the matrix operations for PV search.

    DOI: 10.1587/comex.2.86

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  • A Simple Method of Transmitting Stream Adaptation for Fixed-Matrix-Size Precoding on MU-MIMO Transmission Reviewed

    Yafei Hou, Satoshi Sonobe, Kazuto Yano, Masahiro Uno, Kiyoshi Kobayashi

    2012 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC)   136 - 141   2012

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    During the operation of multiuser multiple-input-multiple output (MU-MIMO) algorithms, some antennas of BS or UEs may neither transmit nor receive signals due to the long distance or unexpected damages. Therefore, the BS cannot obtain the channel state information (CSI) from/to these antennas. Without these CSI, the performance of algorithm is degraded. We call this effect as 'broken antenna effect (BAE).' To cope with this issue, this paper proposes a process to regularize the channel matrix by replacing the missing CSI with zero(s) and setting non-zero values to diagonal elements. Then, it is confirmed through computer simulation that the proposed method can adjust the number of transmitting parallel streams according to the number of 'broken' antennas, and provide MU-MIMO transmission with maximum diversity order without any change of the precoding process.

    DOI: 10.1109/WCNC.2012.6213993

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  • Channel Estimation Improvement with Frequency Domain MMSE Equalization for PCP-SC System Reviewed

    Yafei Hou, Tomohiro Hase

    IEICE TRANSACTIONS ON COMMUNICATIONS   E94B ( 6 )   1690 - 1698   2011.6

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    In this paper, we propose a simple but effective way of improving the performance of channel estimation (CE) for pilot cyclic prefixed single carrier (PCP-SC) system. The proposed method utilizes the property that the shifting signal of the PCP pilot signal can also be utilized to estimate the channel information. The receiver can continuously estimate the channel information by just shifting the received pilot signal. Regardless of the signal-to-noise ratio (SNR) and the pilot type, the proposed method can achieve about a 1.72 dB performance gain in terms of the mean squared error (MSE) of channel estimation with a slight increase in computational complexity. The BER performance with the proposed CE improvement are evaluated in a multipath fading channel using a zero-forcing (ZF) equalizer and an minmum mean squared error (MMSE) equalizer by computer simulation. It is shown that the proposed CE improvment method using an MMSE equalizer which has an unbiased vlaue of noise variance (NV) estimator gives a promising BER performance. The proposed method also benefits the estimation of the SNR for the single carrier system.

    DOI: 10.1587/transcom.E94.B.1690

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  • Channel Estimation Improvement for MIMO Single-Carrier Block Transmission System Reviewed

    Yafei Hou, Tomohiro Hase

    2011 IEEE INTERNATIONAL CONFERENCE ON COMMUNICATIONS (ICC)   2011

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    In this paper, we propose an effective way of improving the performance of channel estimation for MIMO single-carrier block transmission (SCBT) systems. The proposed method utilizes the property that the shift of the cyclic pilot signal of each antenna branch can also be utilized to catch the channel information as a new pilot for MIMO SCBT systems. The receiver can continuously estimate the channel information by just shifting the received pilot signal. The channel estimation performance is improved by averaging all channel estimators since this averaging process can reduce the power of noise component. Regardless of the signal-to-noise ratio (SNR) and the pilot type, the proposed method can achieve about a 1.72 dB performance gain in term of the mean squared error (MSE) of channel estimation for each antenna branch with slightly computational complexity. The proposed method can be also utilized to most channel estimation methods for the MIMO SCBT system.

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  • Channel and Noise Variance Estimation Improvement for PCP-SC System Reviewed

    Yafei Hou, Tomohiro Hase

    2010 IEEE WIRELESS COMMUNICATIONS AND NETWORKING CONFERENCE (WCNC 2010)   2010

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    In this paper, we propose a simple but effective way of improving the performance of channel estimation and catching the noise variance for pilot cyclic prefixed single carrier (PCP-SC) system. The proposed method utilizes the property that the shift of the PCP pilot signal can also be utilized to catch the channel information as a new pilot. Regardless of the signal-to-noise ratio (SNR) and the pilot type, the proposed method can achieve about a 1.72 dB performance gain for the mean squared error (MSE) of channel estimation with slightly additional computational complexity. In addition, regardless of the pilot type, the receiver can generate a new random signal from the pilot signal. The new signal has an identical variance value to that of the mixed AWGN noise. The proposed estimation method for noise variance is independent of channel estimation errors. Therefore it simplifies the receiver design and improves the system performance.

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  • Flexible Parallel Combinatory OFDM System Reviewed

    Yafei Hou, Tomohiro Hase

    2ND IEEE INTERNATIONAL CONFERENCE ON ADVANCED COMPUTER CONTROL (ICACC 2010), VOL. 1   436 - 441   2010

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    In this paper, combining the parallel combinatory (PC) code and the a flexible OFDM structure [7], we report the design of a new OFDM system with PC code for various applications with a moderate transmission rate. The system can select appropriate phase sets for all modulated subcarriers for each PC code for different design requirements such as peak-to-average power ratio (PAPR) reduction or HER performance improvement. The proposed system will achieve better PAPR characteristics and promising HER performance. In addition, due to the flexible OFDM structure, the proposed PC-OFDM system will also have properties of high adaptability and compatibility.

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  • New OFDM Structure with Parallel Combinatory Code Reviewed

    Yafei Hou, Tomohiro Hase

    IEEE TRANSACTIONS ON CONSUMER ELECTRONICS   55 ( 4 )   1854 - 1859   2009.11

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    We have introduced a flexible OFDM structure based on a promising property of IFFT operation [7]. This structure can support uplink applications which include many transmitters using different numbers of subcarriers and one receiver with just one IFFT/FFT module with the subcarriers of the least common multiple (LCM) for the number of subcarriers of all the transmitters. In this paper, combining the Parallel combinatory (PC) code and the proposed flexible OFDM structure, we report the design of a new OFDM system with PC code for various applications with a moderate transmission rate. The system can select appropriate Phase sets for all modulated subcarriers for each PC code for different design requirements such ay peak-to-average power ratio (PAPR) reduction or BER performance improvement. The proposed system will achieve better PAPR characteristics and promising BER performance. In addition, due to the flexible OFDM structure, the proposed PC-OFDM system will also have properties of high adaptability and compatibility(1).

    DOI: 10.1109/TCE.2009.5373742

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  • Improvement on the Channel Estimation of Pilot Cyclic Prefixed Single Carrier (PCP-SC) System Reviewed

    Yafei Hou, Tomohiro Hase

    IEEE SIGNAL PROCESSING LETTERS   16 ( 8 )   719 - 722   2009.8

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    The pilot cyclic prefixed single carrier (PCP-SC) system has the ability to achieve channel estimation in a fast-fading environment. It also enables symbol recovery even when the frequency domain of the channel has nulls. This letter proposes a simple but effective way of improving the performance of channel estimation. Regardless of the signal-to-noise ratio (SNR) and the pilot type, the receiver can achieve about a 1.72 dB performance gain for the mean squared error (MSE) of channel estimation if it implements the proposed method with slightly additional computational complexity. The proposed method can also be utilized in any type of pilot in PCP-SC and MIMO systems.

    DOI: 10.1109/LSP.2009.2023953

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  • New Flexible OFDM Structure for Consumer Electronics Communication Systems Reviewed

    Yafei Hou, Tomohiro Hase

    IEEE TRANSACTIONS ON CONSUMER ELECTRONICS   55 ( 1 )   191 - 198   2009.2

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    This paper introduces a promising property in which the transmitter of an OFDM system can utilize an N-point IFFT operation to build the time-domain symbols of a KN-point IFFT operation. Based on this property, we propose a flexible OFDM structure. This structure will support uplink applications which include many transmitters using different numbers of subcarriers and one receiver with just one IFFT/FFT module with the subcarriers of least common multiple (LCM) for the number of subcarriers of all the transmitters. Therefore it reduces the design complexities of the receiver and increases the compatible characteristics for consumer electronics (CE). Compared with the original OFDM system, the proposed system improves the performance of the packet error ratio (PER) and the bit error ratio (BER) performance by using the appropriate K. In addition, the proposed structure can be designed to enlarge the bandwidth efficiency of the system and improve the performance of channel estimation compared with the OFDM/TDM system.(1)

    DOI: 10.1109/TCE.2009.4814434

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  • Parallel Combinatory OFDM/TDM System Reviewed

    Yafei Hou, Tomohiro Hase

    ISCE: 2009 IEEE 13TH INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   165 - +   2009

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    Combined with OFDM with time division multiplexing (OFDM/TDM) system and parallel combinatory (PC) code, we propose a new OFDM system which can be utilized to the communication systems of consumer electronics. Compared with the original OFDM system, the proposed system will achieve promising BER performance and better PAPR characteristics.

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  • Improvement on the Channel Estimation of Pilot Cyclic Prefixed Single Carrier (PCP-SC) System Reviewed

    Yafei Hou, Tomohiro Hase

    2009 IEEE 70TH VEHICULAR TECHNOLOGY CONFERENCE FALL, VOLS 1-4   708 - +   2009

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    This paper will propose a simple hut effective way to improve the performance of channel estimation of pilot cyclic prefixed single carrier (PCP-SC) system. The proposed method utilizes the property that the shift of pilot cyclic prefixed signal can also be utilized to catch the channel information as a new pilot. The receiver can continuously estimate the channel information by just shifting the received signal. Regardless or signal-to-noise ratio (SNR) and pilot type, the receiver can achieve about 1.72 dB performance gain for MSE of channel estimation if it implements the proposed method with a slight additional computational complexity. The proposed method can also be utilized in any types of pilot in PCP-SC and MIMO system.

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  • New OFDM System without Guard Interval Reviewed

    Yafei Hou, Tomohiro Hase

    2009 IEEE INTERNATIONAL CONFERENCE ON CONSUMER ELECTRONICS   159 - 160   2009

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    This paper proposes a new OFDM system without a guard interval (GI) based on the useful characteristics of IFFT operation. The system utilizes the pilot signal to capture the channel information as well as GI does. Therefore, the bandwidth efficiency of the system can be improved. In addition, it achieves promising peak-to-average power ratio (PAPR) characteristics which also decrease the cost of handsets.

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  • OFDM transmitter structure with low PAPR Reviewed

    Yafei Hou, Tomohiro Hase

    2008 IEEE INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   590 - +   2008

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    This paper proposes a new OFDM transmitter structure which can be realized by a smaller FFT chip based on the useful characteristics of IFFT operation. The proposed system benefits the design of handsets. In addition, it achieves promising peak-to-average power ratio (PAPR) characteristics which also decreases the cost of handsets.

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  • Collision-captured multicarrier modulation system Reviewed

    Yafei Hou, Tomohiro Hase

    2008 IEEE SARNOFF SYMPOSIUM   345 - +   2008

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    This paper proposes a new system called the collision-captured multicarrier modulation system which can realize the capture of a packet collision. Based on the OFDM system using partial symbol transmission, the transmitter can select a specific duration to achieve promising PAPR characteristics and realize the capture of a packet collision. The simulated results show that over 90% collision occurrences and the correct position of the collided part can be captured even in severe near-far situations. The proposed system can also achieve a PAPR reduction with an acceptable BER performance degradation.

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  • Collision-Recovery Method for Collided OFDM Based Packets Reviewed

    Yafei Hou, Tomohiro Hase

    2008 IEEE 19TH INTERNATIONAL SYMPOSIUM ON PERSONAL, INDOOR AND MOBILE RADIO COMMUNICATIONS   688 - 693   2008

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    We present an effective method of collision recovery for orthogonal frequency division multiplexing (OFDM)-based communications. For the OFDM system, the modulated message data can be demodulated using the partial time-domain OFDM symbol. Therefore, the partial time-domain symbol can be adopted to reconstruct the whole OFDM time-domain symbol with estimated channel information. This property can be utilized to recover packets from the collisions. Since most collisions are cases in which a long packet collides with short packets, the collided part is assumed to be short. The simulated results show that the method can recover all packets with different specific probabilities and can be developed to solve the problem of hidden terminals.

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  • OFDM system for capturing collision Reviewed

    Yafei Hou, Tomohiro Hase

    2008 IEEE INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   601 - +   2008

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    This paper proposes a new system called the collision-captured OFDM system which can realize the capture of a packet collision based on the OFDM system using partial symbol transmission. The simulated results show that over 90% of collision occurrences and the correct position of the collided part can be captured even in severe near-far situations.

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  • A new way of PAPR reduction for OFDM system Reviewed

    Yafei Hou, Tomohiro Hase

    2008 IEEE INTERNATIONAL SYMPOSIUM ON CONSUMER ELECTRONICS, VOLS 1 AND 2   586 - +   2008

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    This paper proposes a new peak-to-average power ratio (PAPR) reduction technique for OFDM systems. The proposed system selects the specific duration of each time-domain OFDM symbol which can achieve a promising PAPR, to transmit equal bits of data. Compared with the OFDM system using amplitude clipping, PST can obtain comparable PAPR performance and achieve a 0.5 - 3 dB BER performance gain by choosing the appropriate parameters. In addition, PST does not need any complex modules to fix the original phases of the clipped samples, so it decreases the cost of transmitters.

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  • A novel modulation with parallel combinatory and high compaction multi-carrier modulation Reviewed

    Yafei Hou, Masanori Hamamura

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E90A ( 11 )   2556 - 2567   2007.11

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    In this paper, we propose a new modulation named parallel combinatory/high compaction multi-carrier modulation (PC/HC-MCM) using the techniques of parallel combinatory orthogonal frequency division multiplexing (PC-OFDM) and high compaction multi-carrier modulation (HC-MCM). Two types of PC/HC-MCM systems, which are named as modulated PC/HC-MCM system and (unmodulated) PC/HC-MCM system, can be designed. The modulated PC/HC-MCM system achieves better bit-error rate (BER) performance than that of HC-MCM system with equal bandwidth efficiency (BWE). The PC/HC-MCM system can obtain the better peak-to-average power ratio (PAPR) characteristics by selecting appropriate constellation for each subcarrier. On the other hand, since PC/HC-MCM can divide the PC-OFDM symbol duration into multiple time-slots, the advantages of frequency hopping (FH) can be applied in the PC/HC-MCM system. Therefore, we also combine the PC/HC-MCM and frequency hopping multiple access (FHMA) to propose a novel multiple access (MA) system. It can simultaneously transmit multiple users' data within one symbol duration of PC-OFDM.

    DOI: 10.1093/ietfec/e90-a.11.2556

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  • Collision recovery for OFDM system over wireless channel Reviewed

    Yafei Hou, Masanori Hamamura

    IEICE TRANSACTIONS ON FUNDAMENTALS OF ELECTRONICS COMMUNICATIONS AND COMPUTER SCIENCES   E90A ( 7 )   1312 - 1322   2007.7

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    We present an effective method of collision recovery for orthogonal frequency division multiplexing (OFDM)-based communications. For the OFDM system, the modulated message data can be demodulated using the partial time-domain OFDM signal. Therefore, the partial time-domain signal can be adopted to reconstruct the whole OFDM time-domain signal with estimated channel information. This property can be utilized to recover packets from the collisions. Since most collisions are cases in which a long packet collides with a short packet, the collided part is assumed to be short. The simulated results show that the method can recover the two collided packets with a certain probability and can be developed to solve the problem of hidden terminals. This method will dramatically benefit the protocol design of wireless networks, including ad hoc and sensor networks.

    DOI: 10.1093/ietfec/e90-a.7.1312

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  • Fast index for XML data Reviewed

    Ping Yi, Yafei Hou, Yue Wu, Jianhua Li

    Journal of Computational Information Systems   3 ( 1 )   97 - 107   2007.2

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  • Novel parallel combinatory system with high compaction multicarrier modulation Reviewed

    Journal on Communications   28 ( 1 )   69 - 74   2007.1

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  • Flooding attack and defence in ad hoc networks Reviewed

    Yi Ping, Hou Yafei, Zhong Yiping, Zhang Shiyong, Dai Zhoulin

    Journal of Systems Engineering and Electronics   17 ( 2 )   410 - 416   2006.6

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    DOI: 10.1016/s1004-4132(06)60070-4

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  • An Investigation of the Tradeoff between the Power Efficiency and Constellation Performance for RIS based Spatial Modulation System

    前崎一星, 虫明春哉, HOU Yafei, 田野哲

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • A configuration for overloaded MU-MIMO systems

    宮田一輝, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   123 ( 108(RCS2023 79-100) )   2023

  • Mitigation of the Performance Loss of Spatial Modulation using LCX from Position Mismatch

    嶽草一郎, 永山拳大, HOU Yafei, 田野哲

    電子情報通信学会大会講演論文集(CD-ROM)   2023   2023

  • 位置情報を用いた漏洩同軸ケーブルスロットの開閉による空間変調の容量拡大の研究

    侯亜飛, 田野哲

    電気通信普及財団研究調査助成報告書(Web)   ( 37 )   2022

  • 過負荷MIMO無線通信システムのための線形受信機の研究

    田野哲, 侯亜飛

    電気通信普及財団研究調査助成報告書(Web)   ( 37 )   2022

  • A Study on Iterative Soft Decision Maximum Likelihood Decoding Method for MIMO-OFDM

    真壁修平, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   121 ( 391(RCS2021 251-299) )   2022

  • Iterative Soft Decision Maximum Likelihood Decoding Method for MIMO-OFDM

    真壁修平, 田野哲, HOU Yafei

    電子情報通信学会大会講演論文集(CD-ROM)   2022   2022

  • Performance of Frequency Domain Non-orthogonal Multiple Access With Adaptive Resource Allocation

    田野哲, 山上太智, HOU Yafei

    電子情報通信学会技術研究報告(Web)   122 ( 235(RCS2022 128-154) )   2022

  • Nonlinear Overloaded MIMO Communication System with Equal Gain Filter

    杉本匠, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   122 ( 252(RCS2022 155-184) )   2022

  • Characteristics of Non-Orthogonal Multiple Access that allocates subcarriers based on factor graphs

    山上大智, 田野哲, 侯亜飛

    電子情報通信学会大会講演論文集(CD-ROM)   2021   2021

  • Multi-input Physical Layer Network Coding In wireless two-way relay networks

    次田英明, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   120 ( 406(SRW2020 51-83) )   2021

  • Non-Orthogonal Multiple Access that allocates subcarriers based on factor graphs

    山上大智, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   120 ( 406(SRW2020 51-83) )   2021

  • Maximum Likelihood Doppler Frequency Detection Using Channel Impulse Response Estimation

    堀田和真, 田野哲, HOU Yafei

    電子情報通信学会大会講演論文集(CD-ROM)   2021   2021

  • Positioning Scheme by vertical placement for LCX-MIMO system

    永山拳大, ZHU Junjie, HOU Yafei, 田野哲

    電子情報通信学会大会講演論文集(CD-ROM)   2021   2021

  • Opportunistic Scheduling for Downlink MU-MIMO Systems

    LU Youchen, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   121 ( 145(SRW2021 13-28) )   2021

  • Optimal terminal selection based on Doppler frequency estimation for terminal cooperative communications

    藤井拓真, 田野哲, HOU Yafei, 村田英一

    電子情報通信学会技術研究報告(Web)   121 ( 173(CQ2021 37-62) )   2021

  • Precoding method for Overloaded Physical-Layer Network Coding

    谷川智也, 田野哲, HOU Yafei

    電子情報通信学会大会講演論文集(CD-ROM)   2021   2021

  • A proposal of Spatial Modulation using Slots of Leaky Coaxial Cable

    永山拳大, ZHU Junjie, HOU Pengcheng, HOU Yafei, 田野哲

    電子情報通信学会大会講演論文集(CD-ROM)   2021   289 - 290   2021

  • Soft Input Decoding Based on Superposition of Hard Decision Signals

    柏原光希, 田野哲, HOU Yafei

    電子情報通信学会技術研究報告(Web)   121 ( 265(SRW2021 29-52) )   2021

  • A Study on Generalized Time-Frequency Spatial Modulation System using Variable Partial OFDM Symbol Transmission

    青山智哉, HOU Yafei, 田野哲

    電子情報通信学会技術研究報告(Web)   121 ( 234(RCS2021 143-174) )   2021

  • Iterative Hard Dicision Decoding in a Linear Multilevel QAM Receiver for Overloaded MIMO

    119 ( 377 )   1 - 6   2020.1

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  • Research and Development on Outage Probability Prediction of Required QoS for Factory Environment

    矢野一人, 菅宣理, 菅宣理, WEBBER Julian, WEBBER Julian, HOU Yafei, HOU Yafei, 新居英志, 東森敏英, 鈴木義規

    電子情報通信学会技術研究報告(Web)   120 ( 204(RCS2020 92-109) )   2020

  • Soft Decision Decoding using MMSE-Based Lattice Reduction for MIMO

    柏原光希, 田野哲, HOU Yafei

    電子情報通信学会大会講演論文集(CD-ROM)   2020   2020

  • Shared Dataset Framework toward Applications of Machine Learning and Mathematical Optimization for 6G

    丸田一輝, 井田悠太, HOU Yafei, 牟田修, 岡田啓, 西村寿彦, 岡本英二, 眞田幸俊, 村田英一, 田野哲

    電子情報通信学会技術研究報告(Web)   120 ( 204(RCS2020 92-109) )   2020

  • A Study on Categorization of Busy/Idle History for Autoregressive Based Busy/Idle Duration Prediction over Real Environmental Channel

    118 ( 434 )   121 - 126   2019.1

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  • Prediction Scheme of WLAN Idle Status using Probabilistic Neural Network and Implementation on FPGA

    ウェバー ジュリアン, メーボドニヤ アボルファズル, 侯 亜飛, 矢野 一人, 臼井 誠, 熊谷 智明

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 457 )   117 - 124   2018.2

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  • Side band selection for cancellation of periodic interference

    木村 祐哉, 田野 哲, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 394 )   61 - 65   2018.1

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  • Side band selection for cancellation of periodic interference

    木村 祐哉, 田野 哲, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 396 )   61 - 65   2018.1

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  • Side band selection for cancellation of periodic interference

    木村 祐哉, 田野 哲, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   117 ( 395 )   61 - 65   2018.1

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  • Space-Time Block Coding in a Single Frequency Network with partial Layered Division Multiplexing for DTV Terrestrial System (放送技術)

    PADERNA Ryan, HOU Yafei, OKADA Minoru

    映像情報メディア学会技術報告 = ITE technical report   41 ( 11 )   37 - 40   2017.3

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  • Throughput Measurement of 2-by-2 LCX-MIMO System over Linear Corridor Environment (放送技術)

    ZHU Zeyu, ZHANG Hao, HOU Yafei, TSUKAMOTO Satoshi, HIGASHINO Takeshi, OKADA Minoru, KUMAGAI Tomoaki

    映像情報メディア学会技術報告 = ITE technical report   41 ( 6 )   37 - 40   2017.2

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  • Localization of Radio Terminals in Leaky Coaxial Cable MIMO System

    岡田 実, 東野 武史, 侯 亜飛

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 397 )   7 - 11   2017.1

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  • Throughput Measurement Configuration of 2-by-2 LCX-MIMO System over Real Indoor Linear-cell Environment (信号処理)

    ZHANG Hao, ZHU Zeyu, HOU Yafei, TSUKAMOTO Satoshi, HIGASHINO Takeshi, OKADA Minoru, KUMAGAI Tomoaki

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 395 )   223 - 226   2017.1

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  • Channel Occupancy Ratio Prediction in Real Environment Using Auto-regressive Integrated Predictor

    HOU Yafei, HOU Yafei, WEBBER Julian, MEHBODNIYA Abolfazl, YANO Kazuto, KUMAGAI Tomoaki

    電子情報通信学会大会講演論文集(CD-ROM)   2017   2017

  • Prediction of Idle Slot Availability using Probabilistic Neural Network for WLAN

    WEBBER Julian, MEHBODNIYA Abolfazl, HOU Yafei, HOU Yafei, YANO Kazuto, KUMAGAI Tomoaki

    電子情報通信学会大会講演論文集(CD-ROM)   2017   2017

  • Channel Busy/Idle Duration Prediction Using Auto-regressive Predictor for Video and Audio Service over WLAN System

    HOU Yafei, HOU Yafei, WEBBER Julian, YANO Kazuto, KUMAGAI Tomoaki

    電子情報通信学会大会講演論文集(CD-ROM)   2017   2017

  • WLAN Link Variability and Its Implications for Packet Prediction and Link Adaptation

    GONZALEZ Miguel Angel Patino, GONZALEZ Miguel Angel Patino, WEBBER Julian, HOU Yafei, HOU Yafei, YANO Kazuto, KUMAGAI Tomoaki

    電子情報通信学会大会講演論文集(CD-ROM)   2017   2017

  • Low Complexity Compressed Sensing Based Channel Estimation with Measurement Matrix Optimization for OFDM System (無線通信システム)

    FERDIAN Rian, PUSPITA Ratih H., HOU Yafei, OKADA Minoru

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   116 ( 318 )   17 - 21   2016.11

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  • Time Domain Compressed Sensing based Channel Estimation in Fast Fading Channel with Fractional Delay (放送技術)

    PADERNA Ryan, THANG Duong Quang, HOU Yafei, HIGASHINO Takeshi, OKADA Minoru

    映像情報メディア学会技術報告 = ITE technical report   40 ( 35 )   5 - 8   2016.10

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  • Bluetooth Low Energyマルチホップ通信を用いた斜面崩壊予兆検知システムの実装と評価

    藤本 まなと, 松本 誠義, 諏訪 博彦, 荒川 豊, 侯 亜飛, 塚本 悟司, ウエバー ジュリアン, 矢野 一人, 畑山 満則

    マルチメディア,分散協調とモバイルシンポジウム2016論文集   ( 2016 )   638 - 644   2016.7

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  • Autonomous Establishment of Multi-Hop Sensor Network Using Wireless LAN and Bluetooth and Priority Control Considering Property of Information

    矢野 一人, 塚本 悟司, ウェバー ジュリアン, 熊谷 智明, 侯 亜飛, 藤本 まなと, 諏訪 博彦, 荒川 豊, 畑山 満則

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 472 )   49 - 54   2016.3

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  • B-17-8 Multi-hop Network System with WLAN and Bluetooth

    Tsukamoto Satoshi, Webber Julian, Yano Kazuto, Kumagai Tomoaki, Hou Yafei, Fujimoto Manato, Suwa Hirohiko, Arakawa Yutaka

    Proceedings of the IEICE General Conference   2016 ( 1 )   611 - 611   2016.3

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  • Construction of Sensor Network for Detecting Slope Failures using Secondhand Smartphones

    諏訪 博彦, 松本 誠義, 藤本 まなと, 荒川 豊, 侯 亜飛, 塚本 悟司, ウエバー ジュリアン, 矢野 一人, 畑山 満則

    社会情報システム学シンポジウム学術講演論文集   22   209 - 212   2016.1

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  • LCX(漏えい同軸ケーブル)を用いた無線LANシステム

    塚本 悟司, 侯 亜飛, 鈴木 文生, 丹羽 敦彦

    電子情報通信学会 通信ソサイエティマガジン   10 ( 2 )   86 - 91   2016

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    DOI: 10.1587/bplus.10.86

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  • アンライセンスバンドの周波数資源の利活用 LCX(漏えい同軸ケーブル)を用いた無線LANシステム

    塚本悟司, HOU Yafei, 鈴木文生, 丹羽敦彦

    通信ソサイエティマガジン   ( 38 )   2016

  • Bluetooth Low Energyマルチホップ通信を用いた斜面崩壊予兆検知システムの実装と評価

    藤本まなと, 松本誠義, 諏訪博彦, 荒川豊, HOU Yafei, 塚本悟司, WEBBER Julian, 矢野一人, 畑山満則

    情報処理学会シンポジウムシリーズ(CD-ROM)   2016 ( 1 )   2016

  • 大容量無線通信の実現に向けた非線形MU-MIMOの伝送性能評価

    矢野一人, 塚本悟司, 薗部聡司, 薗部聡司, HOU Yafei, HOU Yafei, 前田隆宏, 伴弘司, 伴弘司, 宇野雅博, 宇野雅博, 小林聖, 小林聖

    電子情報通信学会論文誌 B(Web)   J99-B ( 8 )   2016

  • Capacity Comparison of 4-by-4 MIMO Channel Using Leaky Coaxial Cables for Linear-cells with Different Power Allocation Methods (高信頼制御通信)

    LI Sha, HOU Yafei, HIGASHINO Takeshi

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   115 ( 366 )   251 - 256   2015.12

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  • A-5-11 MUSIC-algorithm-based Positioning Scheme for LCX-MIMO system

    Oki Shuhei, Hou Yafei, Higashino Takeshi, Okada Minoru

    Proceedings of the IEICE General Conference   2015   121 - 121   2015.2

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  • B-17-10 Service Detection for Audio and Video Using Periodical Characteristics of Transmission Pattern

    Hou Yafei, Miyasaka Tomohiro, Yano Kazuto, Ariyoshi Masayuki, Kumagai Tomoaki

    Proceedings of the IEICE General Conference   2015 ( 1 )   557 - 557   2015.2

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  • Two-dimensional Positioning for Radio Terminal in 4 by 4 MIMO System Using Leaky Coaxial Cable Antenna

    OKI Shuhei, Hou YAFEI, HIGASHINO Takeshi, OKADA Minoru

    ITE Technical Report   39 ( 0 )   45 - 48   2015

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    This article proposes a positioning method for radio terminals by using Leaky Coaxial Cable(LCX) antenna. A Longitudinal position detection method in 2 by 2 LCX-MIMO system using signal TDoA has already proposed. This article expands this system in 4 by 4 LCX-MIMO system and explains how to detect a radial position in 4 by 4 system. In addition, MUSIC algorithm is introduced in the proposal method to estimate position accurately. As a result of performance evaluation by the computer, it is found that the proposed method has high accuracy compared with the conventional method.

    DOI: 10.11485/itetr.39.4.0_45

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  • MUSIC Algorithm based Accurate Radio Terminal Positioning in LCX-MIMO System

    OKI Shuhei, YAFEI Hou, HIGASHINO Takeshi, OKADA Minoru

    電子情報通信学会技術研究報告 = IEICE technical report : 信学技報   114 ( 370 )   119 - 123   2014.12

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    This article proposes an accuracy improving method by using signal Time Difference Of Arrival (TDOA) in LCX positioning system for radio terminals. The MUSIC algorithm is introduced in the proposal method to estimate position accurately without increasing frequency bandwidth. As a result of computer simulation, it is found that the proposed method has high accuracy compared with the estimation method which using IFFT.

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  • Linear Cell MIMO Using Leaky Coaxial Cable : A Realization of High Reliability and Low Latency System in 5th Generation Mobile Communications Network

    TSUKAMOTO Satoshi, MAEDA Takahiro, HOU Yafei, ARIYOSHI Masayuki, KOBAYASHI Kiyoshi, KUMAGAI Tomoaki

    Technical report of IEICE. RCS   114 ( 254 )   55 - 60   2014.10

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    We studied multi-input multi-output(MIMO) techniques for a linear cell with leaky coaxial cables (LCXs) to reduce hand over frequency in a small cell and to keep spacial multiplicity high in the line-of-sight conditions. In this paper, an advantage of linear cell with an LCX is described, and then a structure of the LCX and a principle of electromagnetic radiation from the LCX are explained. After we introduce the proposed methods that are 2 by 2 MIMO with a single LCX and with closely separation LCXs, feasibility of the proposed methods are shown by results of a condition number calucuration and experiments using equipments of wireless local area networks on the market.

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  • B-1-147 Block Error Rate Measurements of 2×2 MIMO System with Single Leaky Coaxial Cable

    Tsukamoto Satoshi, Maeda Takahiro, Hou Yafei, Ariyoshi Masayuki, Kobayashi Kiyoshi

    Proceedings of the Society Conference of IEICE   2014 ( 1 )   147 - 147   2014.9

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  • A Proposal for Radio on Optical OOK System

    KANEKO Yuya, HIGASHINO Takeshi, HOU Yafei, OKADA Minoru

    IEICE technical report   114 ( 163 )   129 - 130   2014.7

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    Data offloading by distributed many femto-cell base stations is one of solutions to provide large wireless communication capacity. Radio over Fiber (RoF) technique can integrate the base stations and reduce the cost of maintenance. In this paper, a simultaneous transmission scheme for both optical On-Off Keying (OOK) signal and radio frequency (RF) signal is proposed. The quality of the RF signal transmitted with 10G Ethernet is experimentally evaluated. An interference suppression scheme and an optimum threshold for detecting OOK signal are proposed.

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  • A Proposal for Radio on Optical OOK System

    KANEKO Yuya, HIGASHINO Takeshi, HOU Yafei, OKADA Minoru

    Technical report of IEICE. RCS   114 ( 164 )   183 - 184   2014.7

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    Data offloading by distributed many femto-cell base stations is one of solutions to provide large wireless communication capacity. Radio over Fiber (RoF) technique can integrate the base stations and reduce the cost of maintenance. In this paper, a simultaneous transmission scheme for both optical On-Off Keying (OOK) signal and radio frequency (RF) signal is proposed. The quality of the RF signal transmitted with 10G Ethernet is experimentally evaluated. An interference suppression scheme and an optimum threshold for detecting OOK signal are proposed.

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  • A Proposal for Radio on Optical OOK System

    KANEKO Yuya, HIGASHINO Takeshi, HOU Yafei, OKADA Minoru

    IEICE technical report. RCC, Reliable communication and control   114 ( 162 )   151 - 152   2014.7

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    Data offloading by distributed many femto-cell base stations is one of solutions to provide large wireless communication capacity. Radio over Fiber (RoF) technique can integrate the base stations and reduce the cost of maintenance. In this paper, a simultaneous transmission scheme for both optical On-Off Keying (OOK) signal and radio frequency (RF) signal is proposed. The quality of the RF signal transmitted with 10G Ethernet is experimentally evaluated. An interference suppression scheme and an optimum threshold for detecting OOK signal are proposed.

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  • A Proposal for Radio on Optical OOK System

    KANEKO Yuya, HIGASHINO Takeshi, HOU Yafei, OKADA Minoru

    IEICE technical report. ASN, Ambient intelligence and sensor networks   114 ( 166 )   159 - 160   2014.7

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    Data offloading by distributed many femto-cell base stations is one of solutions to provide large wireless communication capacity. Radio over Fiber (RoF) technique can integrate the base stations and reduce the cost of maintenance. In this paper, a simultaneous transmission scheme for both optical On-Off Keying (OOK) signal and radio frequency (RF) signal is proposed. The quality of the RF signal transmitted with 10G Ethernet is experimentally evaluated. An interference suppression scheme and an optimum threshold for detecting OOK signal are proposed.

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  • A Proposal for Radio on Optical OOK System

    KANEKO Yuya, HIGASHINO Takeshi, HOU Yafei, OKADA Minoru

    IEICE technical report. SR, Smart radio   114 ( 165 )   171 - 172   2014.7

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    Data offloading by distributed many femto-cell base stations is one of solutions to provide large wireless communication capacity. Radio over Fiber (RoF) technique can integrate the base stations and reduce the cost of maintenance. In this paper, a simultaneous transmission scheme for both optical On-Off Keying (OOK) signal and radio frequency (RF) signal is proposed. The quality of the RF signal transmitted with 10G Ethernet is experimentally evaluated. An interference suppression scheme and an optimum threshold for detecting OOK signal are proposed.

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  • Development of Nonlinear Multi-user MIMO Transmission System Based on Vector Perturbation and Its Field Experimental Results

    YANO Kazuto, TSUKAMOTO Satoshi, SONOBE Satoshi, HOU Yafei, BAN Hiroshi, UNO Masahiro, KOBAYASHI Kiyoshi

    The Journal of the Institute of Electronics, Information, and Communication Engineers   97 ( 4 )   307 - 312   2014.4

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    筆者らは,見通し伝搬路のような伝搬路相関の高い環境における伝送特性を改善するため,ベクトル摂動(Vector Perturbation)に基づく8×8アンテナ構成の非線形マルチユーザMIMO-OFDM伝送システムを開発した.本稿ではその概要を述べ,屋外見通し伝搬路における伝送実験を通じ,空間フィルタリングに基づく線形マルチユーザMIMO伝送と比較して本伝送方式が約1.9倍の周波数利用効率を達成可能であることを示す.更に,本伝送実験を通じて明らかになった非線形マルチユーザMIMOの実用化に向けた課題についても述べる.

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  • B-5-108 Sequentially Switched Antenna Array Receiver : Enhancing Data Transmission Rate on High Speed Vehicles

    Tsukamoto Satoshi, Hou Yafei, Ariyoshi Masayuki, Baba Ryosuke, Yamamoto Shinichiro, Aikawa Satoru

    Proceedings of the IEICE General Conference   2014 ( 1 )   503 - 503   2014.3

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  • B-5-109 Basic Study of Propagation Performance for Sequentially Switched Antenna Array Receiver

    Baba Ryosuke, Yamamoto Shinichiro, Aikawa Satoru, Tsukamoto Satoshi, Hou Yafei, Ariyoshi Masayuki

    Proceedings of the IEICE General Conference   2014 ( 1 )   504 - 504   2014.3

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  • B-1-206 Bandwidth Efficiency of MMSE based MIMO System Using Single LCX Cable

    Hou Yafei, Tsukamoto Satoshi, Ariyoshi Masayuki, Kobayashi Kiyoshi

    Proceedings of the IEICE General Conference   2014 ( 1 )   206 - 206   2014.3

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  • Basic Performance Evaluation on Sequentially Switched Antenna Array Receiver : Enhancing Data Transmission Rate on High Speed Vehicles

    Baba Ryosuke, Yamamoto Shinichiro, Aikawa Satoru, Tsukamoto Satoshi, Hou Yafei, Ariyoshi Masayuki

    IEICE technical report   113 ( 457 )   47 - 51   2014.3

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    In recent years, mobile communication terminals such as smartphone are necessities of life, a number of terminals are present at high density in such train. Public wireless LAN service also increased with increasing the mobile communication terminal. It is expected that traffic becomes 10 times in 2020, insufficient capacity of the entrance circuit is concerned. Public wireless LAN service is provided in high-speed mobile such as the Shinkansen. It is the performance degradation cannot be controlled to fast channel fluctuation in the ordinary equalization, new measures are needed. We proposed that switching the receiving antenna in reverse order direction of travel of the train. It is the technology to fix the reception point at a fixed position, to slow down the channel change. The antenna switching technology has problems (1)setting of appropriate antenna element spacing, (2)timing and switching cycle of the antenna, (3)reduction of the influence of the circuit and switch,(4) responding to MIMO. In this draft, it is simulated the characteristics of the received signal for antenna switching technology as a basic study. Result of simulation, it obtained the reception characteristics as much as quiescent even when moving at high speed by the antenna switching technology has been found. However, as an error of antenna switching, the problem of discontinuity occurs in reception characteristics was found.

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  • Requested Talk : An Experimental Study of the Proposed 2x2 MIMO System with Single Leaky Coaxial Cable

    TSUKAMOTO Satoshi, MAEDA Takahiro, HOU Yafei, ANO Susumu, BAN Hirosi, ARIYOSHI Masayuki, KOBAYASHI Kiyoshi, NIWA Atsuhiko, SUZUKI Fumio, HIGASHINO Takeshi, OKADA Minoru

    IEICE technical report. Antennas and propagation   113 ( 428 )   51 - 56   2014.2

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    Since the traffic by mobile phones and wireless LAN terminals is increasing day by day, we are faced with deficiency of radio resource in a densely populated place, such as a conference centre and a train terminal in a big city. Although to introduce small cell and MIMO technique is effective for the problem, the frequency of handover will increase and MIMO capacity will deteriorate due to an increase of line-of -sight situation. Since linear-cell can reduce the frequency of handover, we are focused on leaky coaxial cable (LCX) which can work on the microwave band. This paper introduce a novel 2×2 multiple-input multiple-output (MIMO) system using only a single LCX, which can double the capacity. We evaluate MIMO capacity as an index of condition number. They are shown that cumulative frequency of MIMO-achievable positions and data throughput at few positions as an initial result of the evaluation. Results of study on location detection for triggering a handover are also discussed.

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  • Performance Evaluation of Nonlinear Multiuser MIMO Based on Vector Perturbation over Low Mobility Channel

    Yano Kazuto, Sonobe Satoshi, Hou Yafei, Tsukamoto Satoshi, Uno Masahiro, Kobayashi Kiyoshi

    Proceedings of the Society Conference of IEICE   2013 ( 1 )   "SS - 9"-"SS-10"   2013.9

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  • B-17-2 On the Impact of Duration of Spectrum Sensing for WLAN Systems Considering Imperceptible Signals(B-17.ソフトウェア無線,一般セッション)

    Hou Yafei, Miyasaka Tomohiro, Yano Kazuto, Ariyoshi Masayuki, Kobayashi Kiyoshi

    電子情報通信学会ソサイエティ大会講演論文集   2013 ( 1 )   487 - 487   2013.9

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  • B-5-6 Outdoor Experiments of Symmetrical Symbol Mapping in an Extended Symbol Mapping Area for Vector Perturbation MU-MIMO

    Sonobe Satoshi, Tsukamoto Satoshi, Maeda Takahiro, Hou Yafei, Yano Kazuto, Uno Masahiro, Kobayashi Kiyoshi

    Proceedings of the IEICE General Conference   2013 ( 1 )   416 - 416   2013.3

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  • B-5-7 Symbol Error Ratio Analysis for Zero-forcing Vector Perturbation Algorithm with Mismatch of Modulo Size

    Hou Yafei, Sonobe Satoshi, Tsukamoto Satoshi, Yano Kazuto, Uno Masahiro, Kobayashi Kiyoshi

    Proceedings of the IEICE General Conference   2013 ( 1 )   417 - 417   2013.3

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  • A Study on Modulo Boundary Setting of Vector Perturbation Considering Inter-Stream Interference

    Yano Kazuto, Sonobe Satoshi, Hou Yafei, Tsukamoto Satoshi, Uno Masahiro, Kobayashi Kiyoshi

    Technical report of IEICE. RCS   112 ( 351 )   251 - 256   2012.12

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    To reduce the modulo boundary setting error of vector perturbation using MMSE spatial filtering, this paper proposes a new setting method which considers both the desired signal component and the inter-stream interference component in the received signal after precoding. The effectiveness of the proposed method is confirmed through computer simulation of a downlink multiuser MIMO-OFDM transmission which assumes WINNER II A1 LOS channel.

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  • R&D of a Nonlinear Multiuser MIMO System Targeting Small-Cell Environments : -Its Advantage and Challenges for Practical Systems-

    YANO Kazuto, SONOBE Satoshi, HOU Yafei, TSUKAMOTO Satoshi, BAN Hiroshi, UNO Masahiro, KOBAYASHI Kiyoshi

    Technical report of IEICE. RCS   112 ( 286 )   43 - 48   2012.11

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    The authors have evaluated the performance of MIMO-OFDM transmission based on vector perturbation (VP)precoding in small-cell environment, and studied several techniques to overcome some issues for developing practical systems. This paper shows some results of performance evaluation of the VP-based nonlinear multiuser MIMO-OFDM transmission obtained from computer simulations and indoor experiments using radio equipment developed by the authors. In addition, some issues developing practical systems are explained.

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  • R&D of a Nonlinear Multiuser MIMO System Targeting Small-Cell Environments : Its Advantage Challenges for Practical Systems

    YANO Kazuto, SONOBE Satoshi, HOU Yafei, TSUKAMOTO Satoshi, BEN Hiroshi, UNO Masahiro, KOBAYASHI Kiyoshi

    IEICE technical report. Antennas and propagation   112 ( 285 )   49 - 54   2012.11

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    The authors have evaluated the performance of MIMO-OFDM transmission based on vector perturbation (VP) precoding in small-cell environment, and studied several techniques to overcome some issues for developing practical systems. This paper shows some results of performance evaluation of the VP-based nonlinear multiuser MIMO-OFDM transmission obtained from computer simulations and indoor experiments using radio equipment developed by the authors. In addition, some issues developing practical systems are explained.

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  • A Proposal of a Symmetric Extended Symbol Mapping for Vector Perturbation

    SONOBE Satoshi, TSUKAMOTO Satoshi, MAEDA Takahiro, HOU Yafei, YANO Kazuto, UNO Masahiro, KOBAYASHI Kiyoshi

    Technical report of IEICE. RCS   112 ( 286 )   85 - 90   2012.11

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    This paper proposes a symmetric extended symbol mapping, which assigns signal points symmetrically about the modulo boundaries on the IQ plane of vector perturbation (VP). Although VP improves the throughput of multiuser multiple-input multiple-output (MU-MIMO)transmission over highly correlated channels, the error of modulo boundary setting of a demodulator leads significant performance degradation. The proposed method alleviates the impact of the boundary setting errors by assigning same signal points around the modulo boundaries. Simulation results confirm that the proposed method effectively improves the BER performance.

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  • Impact of spatial filtering weight on performance of multiuser MIMO transmission with vector perturbation

    YANO Kazuto, SONOBE Satoshi, HOU Yafei, TSUKAMOTO Satoshi, UNO Masahiro, KOBAYASHI Kiyoshi

    Technical report of IEICE. RCS   112 ( 239 )   189 - 194   2012.10

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    This paper evaluates the performance of 8×8 downlink multiuser MIMO-OFDM transmission based on vector perturbation (VP) precoding which employs zero-forcing (ZF) or MMSE spatial filtering. Through computer simulations assuming a frame format similar to 3GPP Release 10 downlink and WINNER II A1 LOS channel, it is shown that MMSE-based VP can reduce the norm of the transmission signal vector compared with ZF-based VP, and thus it can achieve higher average sum-rate if the modulo boundary size for demodulation is set properly. It is also confirmed that the modulo boundary size must be set by taking account for the amount of inter-stream interference.

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  • Precoding Weight Interpolation Method to Mitigate Spectrum Efficiency Loss of Vector Perturbation Based Multiuser MIMO with Limited CSI Feedback

    HOU Yafei, SONOBE Satoshi, TSUKAMOTO Satoshi, YANO Kazuto, UNO Masahiro, KOBAYASHI Kiyoshi

    IEICE Technical Report   112 ( 239 )   195 - 200   2012.10

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    Vector perturbation (VP) algorithm requires perfect channel state information (CSI) for optimal perturbation vector search and generating a spatial filter to pre-equalize the MIMO channel function. Due to the limited CSI feedback and realistic computational complexity (CC) due to hardware implementation, MU-MIMO OFDM system will yield the inefficient perturbated vector and mismatched spatial filter which causes large spectrum efficiency (SE) loss. In this paper, by simulation, it shows that most of performance loss of VP algorithm is derived from the mismatched spatial filter. Therefore, we propose a low-complexity linear interpolation for spatial filter to reduce the SE loss. The proposed interpolation scheme firstly rebuilds the CSI of partial subcarriers from limited feedback CSI by time and frequency domain transformation (TFT). After that, the spatial filter matrices of these partial subcarriers are calculated. Finally the spatial filter matrices of all subcarriers are interpolated by a linear interpolation. The complexity analysis and simulated results show that the proposed interpolation scheme can reduce the SE loss of VP based MU-MIMO OFDM system with low computational complexity.

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  • B-5-86 A Proposal on Antenna Selection for Partial Subcarriers Technique for Block Diagonalized Vector Perturbation Algorithm

    Hou Yafei, Sonobe Satoshi, Yano Kazuto, Uno Masahiro, Kobayashi Kiyoshi

    Proceedings of the IEICE General Conference   2012 ( 1 )   485 - 485   2012.3

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  • B-5-57 Effect of MMSE Reception on Downlink Multiuser MIMO OFDM Transmission over Time-Variant Channel

    Yano Kazuto, Sonobe Satoshi, Hou Yafei, Uno Masahiro, Kobayashi Kiyoshi

    Proceedings of the Society Conference of IEICE   421 - 421   2012

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  • Spectral efficiency evaluation of vector perturbation and MMSE MU-MIMO algorithms with least square channel prediction

    HOU Y., Tsukamoto Satoshi, Sonobe Satoshi, Yano Kazuto, Uno Masahiro, Kobayashi Kiyoshi

    Proc. of IEICE Commun. Conf 2012 Sept   420 - 420   2012

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  • B-5-35 Manipulation of Channel Matrix and Precoding Weight to Avoid Collapse of Multiuser MIMO Transmission Due to Partial Link Failure

    Hou Yafei, Sonobe Satoshi, Yano Kazuto, Uno Masahiro, Ueda Masazumi

    Proceedings of the Society Conference of IEICE   2011 ( 1 )   414 - 414   2011.8

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  • Impact of the Channel Feedback Load Reduction on Performance of Downlink Linear and Nonlinear Multiuser MIMO

    SONOBE Satoshi, HOU Yafei, YANO Kazuto, UNO Masahiro, UEBA Masazumi

    IEICE technical report   111 ( 12 )   65 - 70   2011.4

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    Language:Japanese   Publisher:The Institute of Electronics, Information and Communication Engineers  

    In this paper, on downlink multiuser MIMO-OFDM system, we evalute the impact of reducing the number of subaband on the performance of linear and non-linear algorithms for the purpose of channel feedback load reduction. We also evalute the impact of an analog feedback method, which sends back a channel value estimated at reciever side and can reduce the channel feedback load further. The simulation result shows that reducing the number of subband to 50, the spectral efficiency of linear and non-linear algorithms degrades. Especially the saturated spectral efficiency of linear algorithm degrades largely. In addition, it is shown that using analog feedback, the performance of VP and BD-VP improves largely with reducing the channel feedback load to about 1/3 to 1/4 against the digital feedback. Especially the performance of BD-VP improves in case of high SNR and high Rician factor.

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  • Performance Comparison Among Vector Perturbation, Block Diagonalized Vector Perturbation and Tomlinson-Harashima precoding over MU-MIMO Spatially Correlated Channel

    HOU Yafei, SONOBE Satoshi, YANO Kazuto, UNO Masahiro, UEBA Masazumi

    IEICE technical report   111 ( 12 )   59 - 64   2011.4

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    In this paper, we evaluate the spectral efficiency of the block diagonalized vector perturbation (BD-VP), vector perturbation (VP) and Tomlinson-Harashima precoding (THP) algorithms over correlated MIMO channels with channel state information (CSI) error. The simulated results show that the VP algorithm has high spectral efficiency than the BD-VP algorithm, but it needs a large computational complexity (CC). Although the BD-VP algorithm is more sensitive to high channel correlation than the THP algorithm for a small signal to noise power ratio (SNR) area, we show that it can utilize the interpolation method with noise component cancellation (NCC) to outperform the THP algorithm and achieve to the system capacity of the VP algorithm over correlation channels. Based on the simulated results, the BD-VP algorithm appears a possible way to realize the large spectral efficiency with a relatively small computational complexity over correlated MIMO channels for the picocell or femtocell systems with CSI error.

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Industrial property rights

  • データ補間処理方法、データ補間処理装置、プログラム、学習処理装置、および、予測処理装置

    菅 宣理, 矢野 一人, ウェバー ジュリアン, 侯 亜飛, 新居 英志, 東森 敏英, 鈴木 義規

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2020-190717  Date applied:2020.11.17

    Announcement no:特開2022-079868  Date announced:2022.5.27

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  • 通信状況予測装置、通信状況予測方法、および、プログラム

    菅 宣理, 矢野 一人, ウェバー ジュリアン, 侯 亜飛, 東森 敏英, 鈴木 義規

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2020-022540  Date applied:2020.2.13

    Announcement no:特開2021-129206  Date announced:2021.9.2

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  • 通信状況推定装置、通信状況推定方法、および、プログラム

    菅 宣理, 矢野 一人, ウェバー ジュリアン, 侯 亜飛, 東森 敏英, 鈴木 義規

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2020-018514  Date applied:2020.2.6

    Announcement no:特開2021-124999  Date announced:2021.8.30

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  • チャネル状態予測装置、無線通信装置、チャネル状態予測方法、および、プログラム

    ウェーバー ジュリアン, メーボド ニヤ アボルファズル, 侯 亜飛, 矢野 一人, 熊谷 智明

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2017-232442  Date applied:2017.12.4

    Announcement no:特開2019-101792  Date announced:2019.6.24

    Patent/Registration no:特許第7166584号  Date registered:2022.10.28 

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  • チャネル状態予測装置、チャネル状態予測方法、無線通信装置および無線通信方法

    侯 亜飛, ウェーバー ジュリアン, 矢野 一人, 熊谷 智明

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2017-074972  Date applied:2017.4.5

    Announcement no:特開2018-182405  Date announced:2018.11.15

    Patent/Registration no:特許第7032721号  Date registered:2022.3.1 

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  • デジタル無線通信装置およびデジタル無線通信システム

    塚本 悟司, 前田 隆宏, 侯 亜飛, 有吉 正行, 小林 聖, 鈴木 文生, 丹羽 敦彦

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    Applicant:株式会社フジクラ, 株式会社国際電気通信基礎技術研究所

    Application no:特願2015-005292  Date applied:2015.1.14

    Announcement no:特開2016-059025  Date announced:2016.4.21

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  • デジタル無線通信装置およびデジタル無線通信システム

    塚本 悟司, 前田 隆宏, 侯 亜飛, 有吉 正行, 小林 聖, 鈴木 文生, 丹羽 敦彦

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    Applicant:株式会社フジクラ, 株式会社国際電気通信基礎技術研究所

    Application no:特願2015-005292  Date applied:2015.1.14

    Patent/Registration no:特許第5903699号  Date registered:2016.3.25  Date issued:2016.3.25

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  • デジタル無線受信装置およびデジタル無線通信システム

    塚本 悟司, 侯 亜飛, 有吉 正行

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2014-049770  Date applied:2014.3.13

    Announcement no:特開2015-177211  Date announced:2015.10.5

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  • 無線通信システムおよび無線通信装置

    小林 聖, 侯 亜飛, 塚本 悟司, 有吉 正行

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2014-023958  Date applied:2014.2.12

    Announcement no:特開2015-154122  Date announced:2015.8.24

    Patent/Registration no:特許第6330173号  Date registered:2018.5.11  Date issued:2018.5.11

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  • 無線通信システムおよび無線通信装置

    小林 聖, 侯 亜飛, 塚本 悟司, 有吉 正行

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2014-023958  Date applied:2014.2.12

    Announcement no:特開2015-154122  Date announced:2015.8.24

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  • 無線通信システムおよび無線通信装置

    小林 聖, 侯 亜飛, 塚本 悟司, 有吉 正行

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2014-021876  Date applied:2014.2.7

    Announcement no:特開2015-149639  Date announced:2015.8.20

    Patent/Registration no:特許第6330172号  Date registered:2018.5.11  Date issued:2018.5.11

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  • 無線通信システムおよび無線通信装置

    小林 聖, 侯 亜飛, 塚本 悟司, 有吉 正行

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2014-021876  Date applied:2014.2.7

    Announcement no:特開2015-149639  Date announced:2015.8.20

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  • 管理装置、通信システム、無線端末装置、通信制御方法および通信制御プログラム

    岡田 洋侍, 田中 義三, 村上 憲一, 山本 剛史, 山本 裕嗣, 小林 聖, 矢野 一人, 有吉 正行, 宮坂 朋宏, 侯 亜飛, 関口 真理子

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    Applicant:住友電気工業株式会社, 株式会社国際電気通信基礎技術研究所

    Application no:特願2013-244164  Date applied:2013.11.26

    Announcement no:特開2015-104008  Date announced:2015.6.4

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  • 情報管理装置、ローカルネットワークシステム、情報管理方法および情報管理プログラム

    村上 憲一, 岡田 洋侍, 田中 義三, 山本 剛史, 山本 裕嗣, 小林 聖, 矢野 一人, 有吉 正行, 宮坂 朋宏, 関口 真理子, 侯 亜飛

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    Applicant:住友電気工業株式会社, 株式会社国際電気通信基礎技術研究所

    Application no:特願2013-244165  Date applied:2013.11.26

    Announcement no:特開2015-104009  Date announced:2015.6.4

    Patent/Registration no:特許第6478367号  Date registered:2019.2.15 

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  • 無線通信システム、無線通信装置および無線通信方法

    侯 亜飛, 薗部 聡司, 塚本 悟司, 矢野 一人, 宇野 雅博, 小林 聖

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2013-012273  Date applied:2013.1.25

    Announcement no:特開2014-160885  Date announced:2014.9.4

    Patent/Registration no:特許第6047744号  Date registered:2017.2.3  Date issued:2016.12.2

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  • 無線通信システム、無線送信装置および無線通信方法

    侯 亜飛, 薗部 聡司, 塚本 悟司, 矢野 一人, 宇野 雅博, 小林 聖

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2012-221726  Date applied:2012.10.3

    Announcement no:特開2014-075679  Date announced:2014.4.24

    Patent/Registration no:特許第6019298号  Date registered:2016.10.14 

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  • 摂動ベクトル選択装置、通信装置、摂動ベクトル選択方法、及びプログラム

    薗部 聡司, 矢野 一人, 侯 亜飛, 宇野 雅博, 小林 聖

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2012-070049  Date applied:2012.3.26

    Announcement no:特開2013-201706  Date announced:2013.10.3

    Patent/Registration no:特許第5845549号  Date registered:2015.12.4 

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  • 通信装置、通信方法、及びプログラム

    薗部 聡司, 矢野 一人, 侯 亜飛, 宇野 雅博, 小林 聖

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2012-069134  Date applied:2012.3.26

    Announcement no:特開2013-201633  Date announced:2013.10.3

    Patent/Registration no:特許第5830757号  Date registered:2015.11.6 

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  • 無線通信システム、制御装置、無線通信方法、及びプログラム

    侯 亜飛, 薗部 聡司, 宇野 雅博, 矢野 一人, 鈴木 康夫, 上羽 正純

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2011-036536  Date applied:2011.2.23

    Announcement no:特開2012-175476  Date announced:2012.9.10

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  • 受信装置、フィードバック方法、及びプログラム

    宇野 雅博, 矢野 一人, 薗部 聡司, 侯 亜飛, 上羽 正純

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    Applicant:株式会社国際電気通信基礎技術研究所

    Application no:特願2011-035526  Date applied:2011.2.22

    Announcement no:特開2012-175407  Date announced:2012.9.10

    Patent/Registration no:特許第5681901号  Date registered:2015.1.23 

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Awards

  • Excellent Paper Award

    2017.5   IEICE Communications Society  

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  • IEEE GCCE Excellent 5 Years TPC Service Award

    2016.10   IEEE GCCE 2016 委員会  

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  • 平成26年度ATR発明考案賞 「漏洩同軸ケーブルを用いた大容量MIMO伝送技術」

    2015.3   株式会社 国際電気通信基礎技術研究所  

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  • 2023年度 電子情報通信学会 通信ソサイエティ 活動功労賞

    2023.9  

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  • Excellent Research Award

    2022.3   Faculty of Engineering   自己回帰モデルによる無線LANのチャネル占有時間予測法の確立

    Yafei Hou, Satoshi Denno

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  • 電子情報通信学会

    2021.6   短距離無線通信研究会の2020年度優秀学生賞

    次田英明,田野哲,侯亜飛

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  • 電子情報通信学会

    2021.6   短距離無線通信研究会の2020年度優秀学生賞

    堀田和真, 田野哲, 侯亜飛

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  • 電子情報通信学会

    2021.6   短距離無線通信研究会の2020年度優秀学生賞

    谷川智也,田野哲,侯亜飛

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  • IEEE ICACT 2021 Outstanding Paper Award

    2021.2   IEEE ICACT 2021 委員会  

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  • 2020年度 電子情報通信学会 通信ソサイエティ 活動功労賞

    2020.9  

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  • Excellent Paper Award

    2020.5   IEICE Communications Society  

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  • IEEE Broadcast Technology Society

    2016.6   2016 BTS Distinguished Volunteer Award

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  • Excellent Paper Award

    2016.5   IEICE Communications Society  

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  • メダル受賞

    2015.1   IEEE関西支部  

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  • IEEE GCCE 2014 Excellent Paper Award 1st Prize

    2014.10   IEEE Consumer Electronics Society  

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  • 平成24年度 ATR優秀研究賞 「非線形マルチユーザMIMO技術の実用化研究と性能の実証」

    2014.3   株式会社 国際電気通信基礎技術研究所  

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  • IEEE ICACT 2013 Outstanding Paper Award

    2013.1   IEEE ICACT 2013 委員会  

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Research Projects

  • 伝搬路を再構成可能な反射板を用いた複数異なる伝搬路形成による無線端末測位技術の研究

    2024.04 - 2027.03

    公益財団法人 電気通信普及財団  研究助成 

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  • 漏洩同軸ケーブルによる複数端末の2D/3D高精度位置同時推定及び計算量削減手法に関する研究 (3年目)

    2024.04 - 2025.03

    公益財団法人 GMOインターネット財団  GMO研究助成 

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  • 漏洩同軸ケーブルによる複数端末の2D/3D高精度位置同時推定及び計算量削減手法に関する研究 (2年目)

    2023.04 - 2024.03

    公益財団法人 GMOインターネット財団  GMO研究助成 

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  • Intelligent Reflecting Surfaceによるプロアクティブな無線空間制御と耐干渉型空間多重伝送技術の研究開発

    2022.05 - 2024.04

    国立研究開発法人情報通信研究機構 Beyond 5G 研究開発促進事業 

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  • 漏洩同軸ケーブルによる複数端末の2D/3D高精度位置同時推定及び計算量削減手法に関する研究(初年度)

    2022.04 - 2023.03

    公益財団法人 GMOインターネット財団  GMO研究助成 

    侯 亜飛

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  • 無線マルチホップネットワークにおける過負荷通信の研究

    Grant number:21K04061  2021.04 - 2024.03

    Japan Society for the Promotion of Science  Grants-in-Aid for Scientific Research Grant-in-Aid for Scientific Research (C)  Grant-in-Aid for Scientific Research (C)

    田野 哲, 侯 亜飛, 上原 一浩, 冨里 繁

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    Grant amount:\4160000 ( Direct expense: \3200000 、 Indirect expense:\960000 )

    第五世代セルラーや無線LANのIEEE 802.11ax 等の研究開発動向からも分かるように、無線ネットワークの高速化・大容量化が止まることを知らない。また、夥しい数のIoTデバイスとインターネットを繋ぐ無線ネットワークの同時接続数は、本格的なIoT時代であろう次世代には、一桁以上増大させる必要がある。高速化を達成するため、広い連続帯域の割り当てが可能な高周波数帯が次世代の無線通信に割り当てられると想定される。高周波数帯の無線信号は伝送路で大きく減衰する。この問題を緩和する、無線マルチホップネットワークが盛んに検討されている。加えて、IoT社会の実現のため、センサー端末が様々な場所、例えば人が足を踏み入れない場所にも配置される。そのような場所との通信を実現するためにも、無線マルチホップネットワークの適用が検討されている。但し、従来の無線マルチホップネットワークを適用した場合には、ホップ数の増大と共に通信速度が低下する問題がある。この問題を克服するため、送信端末や中継端末に複数アンテナを配置して空間多重を適用することが検討されている。但し、空間多重を適用しても、中継端末や送信端末のアンテナ数が少ないことがボトルネックとなり、通信の速度向上を阻むという問題がある。また、無線ネットワークでは晒され端末・中継端末が容易に生まれ、無線マルチホップネットワーク全体の通信速度を制限するという問題がある。
    本研究は無線マルチホップネットワークにおける上記のボトルネックの解消、あるいは緩和が原理的に可能かどうかという学術的な問いに端を発している。複雑な無線マ ルチホップネットワークにおける「中継機のアンテナ数不足」
    や「さらされ中継局」による通信速度低下問題を研究し、この問題の緩和・解消法を探る。 同時に、緩和・解消法を導入したときの通信速度・通信容量の理論を検討する。

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  • 位置情報を用いた漏洩同軸ケーブルスロットの開閉による空間変調の容量拡大の研究

    2021.04 - 2022.03

    公益財団法人 電気通信普及財団  2020年度研究調査助成  研究調査助成

    侯 亜飛

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  • 2D/3D indoor localization using multiple leaky coaxial cables over irregular wireless coverage environment.

    Grant number:20K04484  2020.04 - 2023.03

    日本学術振興会  科学研究費助成事業 基盤研究(C)  基盤研究(C)

    侯 亜飛, 上原 一浩, 冨里 繁, 田野 哲

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    Grant amount:\4420000 ( Direct expense: \3400000 、 Indirect expense:\1020000 )

    (1) In this year, using the LCX channel model, we built an indoor scenario and generated RSSI data. Based on the data correlation analysis and prediction theory, the lower bound and upper bound of predictability of generated LCX RSSI data have been researched. Then the RSSI value ahead has been predicted using a probabilistic neural network (PNN). The similar research on indoor localization has also been realized with more accurate localization level using PNN.
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    (2) A new research direction of localization of multiple users over wireless coverage using LCX has been proposed, which evaluated the TOA estimation of multiple users in a simultaneous way. Furthermore, we also investigated the capacity improvement of LCX system using spatial modulation with the main idea of on/off the LCX slots.

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  • 過負荷MIMO無線通信システムのための線形受信器の研究

    2020.04 - 2022.03

    公益財団法人 電気通信普及財団  2019年度研究調査助成  研究調査助成

    田野 哲、 侯 亜飛

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  • 狭空間における周波数稠密利用のための周波数有効利用技術の研究開発

    2017.10 - 2021.03

    総務省  電波資源拡大のための研究開発 

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  • スマートフォンアプリケーションによる斜面崩壊検出センサネットワーク構築技術の研究開発

    2015.07 - 2016.03

    総務省  戦略的情報通信研究開発推進事業(SCOPE) 

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    Authorship:Principal investigator 

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  • 超高速移動時の無線通信速度向上に向けた受信点移動型等化技術の研究開発

    2013.09 - 2014.03

    総務省  戦略的情報通信研究開発推進事業(SCOPE) 

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    Authorship:Coinvestigator(s) 

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  • 漏洩同軸ケーブルによる高密度配置リニアセルMIMO システムの研究開発

    2013.04 - 2015.03

    総務省  創造的情報通信技術研究開発推進制度(SCOPE) 

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    Authorship:Coinvestigator(s) 

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  • M2M型動的無線通信ネットワーク構築技術の研究開発

    2012.09 - 2015.03

    総務省  電波資源拡大のための研究開発 

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    Authorship:Coinvestigator(s) 

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  • 非線形マルチユーザMIMO技術の研究開発

    2010.10 - 2013.03

    総務省  電波資源拡大のための研究開発 

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    Authorship:Coinvestigator(s) 

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